If the adult beetle can’t eat the fresh asparagus tips, it won’t stick around. Tell me in the comments! French and Mexican marigolds can also repel asparagus beetles, but it might be better to surround your asparagus bed with them rather than planting them amidst the asparagus crowns, although marigolds also offer protection from nematodes and other plant problems if they’re close by. The common asparagus beetle (Crioceris asparagi) is the most prevalent asparagus pest that damages young asparagus spears.Overwintering as an adult, this slender, elongated beetle bears four white or yellowish spots on its wings, is reddish underneath and on the wing edges, and has a dark-red thorax. Lacewings and ladybugs find asparagus beetles delicious! It has an elongated head with feathery-looking antennae. Asparagus beetles undergo a physiological process to prepare their bodies to withstand freezing temperatures during winter. Often seen as a pumpkin-colored orange beetle with black spots in the western United States, or a medium to dark red beetle with black spots in the east, it is similar in some regards to a ladybug… until you look at its elongated head and almost feathery-looking antennae. The spotted asparagus beetle’s body is similar to that of a ladybug’s, but it has a large, red head. It is metallic blue-black in color with cream or yellow spots on its red-bordered elytra.The larvae are fat gray grubs with dark heads. You can also add a floating row cover after all overwintering beetles are likely to have come out of the soil, provided that you are very sure there aren’t eggs, larvae, or adult asparagus beetles on your plants. After all, you don’t want to secure the plants with their natural predator right there! In addition, the larvae of the spotted asparagus beetle will feed inside developing berries and consume foliage. Adult beetles emerge in early spring after overwintering on old asparagus fronds or in garden debris. Your local gardening center or nursery may not sell lacewings and ladybugs. On some well-managed farms, growers are having issues with asparagus beetle eggs on spears (Figure 1). For asparagus, it’s best to spot-treat with these when you discover adult or larval asparagus beetles, rather than doing widespread spraying when it’s not necessary. Access to the right shelter could increase their survival into spring. Most larvae dislodged this way will lack the energy to climb back up and return to eating, and will subsequently die on the soil’s surface. Michigan’s asparagus industry has decades of experience managing the common asparagus beetle, but more recently this pest has been causing surprisingly difficult problems. Asparagus beetle larvae are dark, green-gray grubs about 1/3 inch (9 mm) long when fully grown. Spotted asparagus beetle larvae are typically darker in color than the common asparagus beetle larvae. You can identify when an asparagus beetle is feeding on your plants when there are holes or pits in the leaves, stalks, or plant structure. Another beetle associated with asparagus is the spotted asparagus beetle. The common asparagus beetle is mostly blue-black, but has cream-colored or pale yellow spots along its back, and an orangish or reddish border to its wings. But just how many beetles are sheltering in these different places? Help! Beetle larva were chosen as a target subject because they are one of the key pests of asparagus (Morrison and Szendrei 2014), they are voracious feeders, easy to collect and handle, and co-occur with asparagus miner on field edges of post-harvest commercial asparagus fields (Ingrao et al. Japanese beetles are a major pest of fruit crops, turf and home gardens, and, since 2009, have become increasingly abundant in west Michigan asparagus fields. Symptoms and Effects: Adults of the common asparagus beetle feed on asparagus spears and ferns. How well do beetles survive in these different habitats? Beetle is about 1/4” long, metallic blue-black with red and white markings. Two to five life cycles can happen in a year’s time, depending on the weather conditions where the plants are. In order to answer this question, it’s important to understand what these beetles are doing in the fall and throughout the upcoming winter. So what’s happening within fields may be just as important as the types of trees that are nearby. They range in colour from light-yellow to dark-brown, depending on the age of the egg. How to Get Rid of Asparagus Beetles In most situations, organic treatment for asparagus beetles is recommended, unless populations are enormous or asparagus … Summer fern feeding can cause defoliation and … They also protect against other pupating insects such as potato bugs, fungus gnats, and cutworms. Spotted asparagus beetle may also affect some cucurbits. However, be sure to check your plants as you harvest to ensure there are no eggs on the plant or on the stalks you’re cutting. Asparagus beetles can overwinter in dead asparagus foliage. A quick harvest of spears as soon as they’ve reached a reasonable length is the best way to discourage asparagus beetles, as it cuts short their life cycle. This information is for educational purposes only. Asparagus beetle Eggs for the asparagus beetle are oval shaped, dark brown, about 1.5 mm long. I was busy so I went on about my business and it was happy about that. We are interested in pollination, chemical ecology, biological control, habitat management, insect transmitted plant diseases and behavioral pest management. One day I stopped briefly to look at one and it appeared almost slug-like. Asparagus beetles—Crioceris spp. Feeding disfigures spears, rendering them unmarketable. Stay tuned to learn more about the research happening in the MSU Vegetable Entomology Lab and Michigan State University Extension! Crioceris asparagi, ‘Common Asparagus Beetle’. Asparagus beetle overwintering cages Research in the Vegetable Entomology Lab focuses on the ecology and management of arthropods that occur in vegetable production. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. Read on, and I’ll tell you everything you need to know about asparagus beetles and how to get rid of them. Here is more about our approach. They will be feeding or laying eggs on asparagus spears and fronds. A recent Google search for “where to buy lacewings and ladybugs” produced 264,000 results. Beneficial nematodes are a great thing to have in your soil! Asparagus beetle larvae vary greatly in colour, ranging from a greasy translucent grey to olive green. While you're here, why not follow us on Facebook and YouTube? Common Asparagus Beetle: Crioceris asparagi (L.) Common asparagus beetle: adult. Larvae of both asparagus beetles are slug-like, and cream-colored or grey with dark heads. We found that asparagus beetles that overwinter in deciduous leaves or old asparagus stalks survive at higher rates compared to pine needles and bark. The spotted beetles are less troublesome as they come out a bit later and feed on the berries rather than the ferns and spears. While I would say that this is pretty obvious, it’s not… because the spotted asparagus beetle is more culinarily-diverse than its cousin. Their elytra (wing covers) have yellow spots and red borders. Where exactly are these beetles coming from? Figure 1. Symptoms The adult beetles are 6-8mm long (about 1/4in), they are black with six yellow blotches on their wing cases and a reddish thorax The asparagus beetle larvae, pupae or grubs are equally dangerous to the plants easting away at the foliage and spears. It is decidedly different in appearance (Figure 11) , life cycle and importance as an asparagus pest. Show your Spartan pride and give the gift of delicious MSU Dairy Store cheese this holiday season! For more information, visit https://extension.msu.edu. It should be relatively easy to see these eggs as they visibly jut out from the fern or spear, creating an almost spiky-looking line along it. These microscopic soil organisms will help you by killing the larvae in their pupa beneath the surface of the soil or in leaf litter. After excessive feeding, the plant may appear to be shriveled and stunted. There is also another species of asparagus beetle known as the spotted asparagus beetle. Birds love to eat both the adult form and the larvae of asparagus beetles. Adult over-winters in trash around garden. But if you do want to try companion plants, look at light-feeding herbs. The asparagus beetle likes to overwinter in leaf litter or other debris near its food, sometimes even inside the hollow stems of older asparagus plants. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464). Good Products To Eliminate Asparagus Beetles (in order): While technically there are four known types of Crioceris, only two have been recorded in modern times. You might not be alarmed when you see the first couple asparagus beetles, but if they’re not dealt with quickly, you will have a perennial problem right along with your perennial vegetables. Once satiated, adult asparagus beetles will begin laying brown, pill-shaped or oval eggs in neat rows. Adults are blue-black beetles with a red prothorax. Asparagus is its only food plant. The larvae of the asparagus beetle are dark gray with a black head. Within a week of its appearance, the common beetles begin laying brown eggs in rows of three to eight on the new spears. The common asparagus beetle larvae have light gray to cream colored bodies and black heads and legs (Figure 3-A). Here’s some information about how to identify these two types. We're always looking to improve our articles to help you become an even better gardener. The larvae emerge within a week and begin to move upward as the plant grows, feeding as they go. Crioceris duodecimpunctata (Spotted Asparagus Beetle) larvae. These will be either on the spears themselves (for the common asparagus beetle), or on the ferns or flowers (frequented by both types). There may be two to five generations of this pest each year. Photos from: Bugwood.org Clemson University - USDA Cooperative Extension Slide Series Injury Both the larvae and the adults damage the asparagus plants. These growers are making frequent insecticide applications to kill the beetles, but populations rebound quickly afterwards. Coming at them from the front or the sides seems to give them more warning and they can escape easier, but they don’t seem to see things coming from above as well. There are multiple generations each year and populations can reach high levels leading to severe loss of spears and foliage. Larvae secrete a black fluid onto the plants. This article contains incorrect information, This article is missing information that I need. The Vegetable Entomology Lab at Michigan State University is working with Michigan asparagus growers to discover where these beetles choose to overwinter. Vegetable Entomology Lab at Michigan State University. What I’ve found that works when hand-picking them is to have a container of soapy warm water on hand. Anywhere that one has been feeding will turn brownish in color. The larvae of asparagus beetles excrete a black or brown liquid. The spotted asparagus beetle is orange with black spots. Crioceris duodecimpunctata, ‘Spotted Asparagus Beetle’. While it’s generally recommended that you use these options in limited amounts, especially on young asparagus stalks, use of a few spray insecticides can help you kill asparagus beetles and their larvae. They will also eat squash bugsand other garden predators. Bright red, cream and dark blue coloured beetles, oval shaped and about 1cm long. Asparagus beetle larvae – These larvae are soft-bodied, plump, humpbacked, wrinkled, and sluggish. It can occasionally lay eggs on the flowers of these plants, and on occasion the larvae will snack on newly-forming melons or squash. The eggs hatch within seven days, creating small larvae. As the season progresses, larvae feed on asparagus foliage. Both work extremely well against most beetles, caterpillars, and a host of other common pests. Common asparagus beetle: larva. Q: I am having problems catching adult beetles. Dra… While asparagus beetles are horrible to any lover of fresh spring asparagus spears, these tips can help you to keep them at bay and protect your future harvest. Eggs are usually found in groups of 3 to 8 oriented in a row and attached by one end to the host plant. While it’s not commercially available, there is a beneficial parasitic wasp that is naturally attracted to asparagus in the wild. With this, pay attention to the staining or darkening of the color of the buds to determine if it is already a symptom of infestation. Spinosad sprays, such as Monterey Garden Insect Spray, can be used quite effectively to control a number of beetles and caterpillars, leaf miners and thrips. Spotted asparagus beetle larvae feed more on the berries rather than the ferns of asparagus. Spotted beetle is bright reddish-orange with small black dots. When the eggs hatch, the larvae will be consumed by the young wasps. Parsley is a great choice in an asparagus bed, especially if you get it started early enough that it surrounds the young spears as they emerge. These are the same beetles that will emerge from overwintering when spring comes. There are two types that are commonly found in the US. Using a soft-bristled brush to knock eggs and larvae off of the plant is generally a good idea, provided that you are careful not to damage the plant. Those plants can than be sprayed to eliminate concentrations of beetles and their larvae. What time isn’t spent around asparagus is generally spent trying to locate a new asparagus plant to dwell on. We expect these results will lead to management recommendations in the future. The listings included brick and mortar businesses and online destinations. We also found that a higher proportion of beetles overwinter within asparagus fields. Q: Are there companion plants that repel asparagus beetles? These larvae will feed on the ferns of the asparagus plants for approximately two weeks before dropping to the soil to pupate. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. They usually will fall right into your soap-water. They secrete a black fluid which stains the plant. This is by far the most common asparagus beetle variety, and the one which is most devastating around asparagus plants. When spears emerge, adults feed on spears and deposit brown-black ugly eggs on the spears that are impossible to wash off. Some of these may be affiliate links, meaning we earn a small commission if items are purchased. Spotted asparagus beetles should not be confused with beneficial lady beetles. Do you grow asparagus, and if so, have you had problems with the asparagus beetle? This article was published by Michigan State University Extension. Keeping Asparagus Beetles at bay. Check out the Agribusiness Management B.S. They start by having a snack to replenish themselves, feasting lightly on the tips of the new shoots. The spotted asparagus beetle is not as destructive to asparagus, but still feeds on it, as I’ll explain a little further on. However, it really prefers the berries of the asparagus fern, and so it’s most likely to be found there where all of its nutrition needs are fully met. Shoots often become curved and irregular in shape due to beetle feeding. The spotted asparagus beetle’s larvae prefer the berries that are formed by the flowering plants to the foliage itself. The beetle is 6.0 mm to 9.5 mm long and slightly elongated. Asparagus. This particular beetle eats both wild plants found in nature and garden plants. The bullet-shaped eggs are laid in rows perpendicular to the stem or fern. Colder climates have fewer life cycles. The common asparagus beetle emerges early, at the same time as the asparagus spear. Their initial appearance is later If you’re very sure that you don’t have overwintering asparagus beetles in your soil, you can keep a floating row cover over your plants. A: The problem with companion planting in asparagus beds is that the asparagus itself is a very heavy feeder as a plant. If your asparagus patch is bird-friendly, they will help you with asparagus beetle control. As a general rule, the asparagus beetle spends the majority of its life in, on, under, or beside asparagus plants. beetles. Although it’s getting cooler during the fall, asparagus beetles are still active and seeking overwintering habitat all throughout and nearby Michigan asparagus fields. Approximately two weeks after emerging from the egg, the larvae are now prepared for pupation. Common asparagus beetle larvae are light gray with a black head. They drop from the plant down into the soil, dig under the surface, and form a cocoon there. Both the adult and larval stages of asparagus beetle eat the foliage of asparagus, they can also gnaw bark from stems, causing growth above the point of damage to dry up. The spotted asparagus beetle larvae are orange and adults are red-orange with black spots. Spinosad and pyrethrin sprays, ladybugs, lacewings, parasitic wasps, beneficial nematodes, neem oil, floating row covers. The eggs of the asparagus beetle are small, brown ovals and will usually be present in abundance. Organic methods of asparagus beetle … Based on data from winter 2019-2020, we found that some beetles overwinter in woodlots and weed margins around asparagus fields, which lines up with grower observations. Preventing Problems: Remove old fronds and weeds from the asparagus patch in early winter and compost in an active compost pile. During winter farm visits, we checked tree bark, leaf litter and asparagus stalks to answer this question. The eggs of the common asparagus beetles are dark brown and cylindrical shaped (Figure 3-B). As long as you do not use any pesticides that are harmful to wasps, this insect will arrive on its own and take up residence nearby. Asparagus Beetle. Also, pyrethrin sprays are a common way of enacting asparagus beetles control. October 12, 2020. 26 Cold Frame Plans For Your Winter Garden, 5 DIY Natural Pest Control Recipes for Your Garden, Asparagus beetle, common asparagus beetle, spotted asparagus beetle, Crioceris asparagi, Crioceris duodecimpunctata. The asparagus beetle, Crioceris asparagi, and the spotted asparagus beetle, C. duodecimpunctata, may both be found in gardens.In California C. asparagi is more likely to be found. So what can you do to battle the beetle? The larvae feed on the tips of asparagus shoots, damaging young plants. The spotted asparagus beetle is often mistaken as a weird ladybug, but this is no beneficial insect. They have black heads and a slug-like body shape. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Both beetles are approximately ¼ inch in length. These eggs do not develop into larvae during harvest, as … Asparagus beetle larvae on fern. The common asparagus beetle (Crioceris asparagi) is an important pest of asparagus crops both in Europe and in North America. MSU is an affirmative-action, equal-opportunity employer. Spring spear feeding reduces crop quality (browning, scarring, staining, and bent growth). As an Amazon Associate, I earn from qualifying purchases. The first type is the common asparagus beetle, which is believed to have European origins. The spotted asparagus beetle’s larvae prefer the berries that are formed by the flowering plants to the foliage itself. insecticides when larvae are first noticed feeding on plants. So now that you know what you’re looking for and what it’s likely to be attacking, how do you eliminate these annoying little beetles from your perennial beds? Beetles and larvae also feed on asparagus fronds later in the season. Jennifer Zavalnitskaya and Zsofia Szendrei, Michigan State University Department of Entomology - Using a product such as neem oil can also prove to be beneficial. A little more about me. The larvae are fat, grayish-green grubs with black heads. Hi, I'm Kevin. Identification: Common asparagus beetle is blue-black, shiny, smooth and 6-9 mm (⅜ inch) long. Adults lay shiny black eggs on the spears; the eggs hatch about a week later. If you see an odd-colored beetle that’s a bluish-black in color with red and white, it might be the common asparagus beetle, Crioceris asparagi. common asparagus beetle is the more widespread of the two species. It takes about a week for the larvae to pupate and then emerge as adults, and then the cycle begins again. Spotted asparagus beetle larvae are orange and adults are reddish orange with six prominent black spots on each wing cover. Most gardeners try to keep everything other than asparagus out of their asparagus beds, including any and all weeds, companion plants, etcetera. Asparagus beetles lay eggs on spears during harvest (A), which reduces spear quality. … Temperatures can only get so low before beetles begin to die so beetles seek out shelter so they are protected as much as possible from freezing temperatures. Life Cycle/Habits. Larvae. 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