We also found that a higher proportion of beetles overwinter within asparagus fields. Asparagus beetles can overwinter in dead asparagus foliage. 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. After excessive feeding, the plant may appear to be shriveled and stunted. The most common of asparagus pests, asparagus beetles weaken plants when fed upon by adults and larvae. 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. Larvae are dark green-gray grubs about 3/4 inch (9 mm) long when full grown. Show your Spartan pride and give the gift of delicious MSU Dairy Store cheese this holiday season! Preventing Problems: Remove old fronds and weeds from the asparagus patch in early winter and compost in an active compost pile. This particular beetle eats both wild plants found in nature and garden plants. beetles. A recent Google search for “where to buy lacewings and ladybugs” produced 264,000 results. There are two types that are commonly found in the US. The eggs of the common asparagus beetles are dark brown and cylindrical shaped (Figure 3-B). The most distinctive markings are three large cream-colored, squarish spots with red margins along each wing cover. 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. These microscopic soil organisms will help you by killing the larvae in their pupa beneath the surface of the soil or in leaf litter. Vegetable Entomology Lab at Michigan State University. 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. 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. Their elytra (wing covers) have yellow spots and red borders. After all, you don’t want to secure the plants with their natural predator right there! Colder climates have fewer life cycles. Q: I am having problems catching adult beetles. They usually will fall right into your soap-water. Eggs. 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. Within a week of its appearance, the common beetles begin laying brown eggs in rows of three to eight on the new spears. The other type is the spotted asparagus beetle. The common asparagus beetle larvae migrate to the ferns and begin to feast upon the plants, and neither the ferns nor the shoots will be safe. Some of these may be affiliate links, meaning we earn a small commission if items are purchased. Anywhere that one has been feeding will turn brownish in color. 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. These will be either on the spears themselves (for the common asparagus beetle), or on the ferns or flowers (frequented by both types). This tiny wasp, Tetrastichus asparagi, will lay its eggs in asparagus beetle larvae. On some well-managed farms, growers are having issues with asparagus beetle eggs on spears (Figure 1). They drop from the plant down into the soil, dig under the surface, and form a cocoon there. 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. Asparagus is its only food plant. The eggs hatch within seven days, creating small larvae. Asparagus beetle larvae vary greatly in colour, ranging from a greasy translucent grey to olive green. We expect these results will lead to management recommendations in the future. Both types of asparagus beetle inhabit North America, but the spotted asparagus beetle is far more common on the eastern half. For more information, visit https://extension.msu.edu. 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. 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. The common asparagus beetle is throughout the country. Crioceris duodecimpunctata (Spotted Asparagus Beetle) I have been noticing these strange varmints on the Asparagus. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. While you're here, why not follow us on Facebook and YouTube? 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. It is decidedly different in appearance (Figure 11) , life cycle and importance as an asparagus pest. Ladybugs and lacewings will happily eat the asparagus beetle eggs and stop larvae from being born. 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. I created Epic Gardening to help teach 10,000,000 people how to grow anything, no matter where they live in the world. The spotted asparagus beetle’s larvae prefer the berries that are formed by the flowering plants to the foliage itself. But there is a down side to growing this phenomenal edible… the asparagus beetle. Lady beetle adults have oval to rounded, dome-shaped bodies with a varying number of spots. Adults of both types overwinter in plant debris and garden trash. The first type is the common asparagus beetle, which is believed to have European origins. Spotted asparagus beetle larvae are typically darker in color than the common asparagus beetle larvae. As an Amazon Associate, I earn from qualifying purchases. Carefully slip the soapy water beneath the beetle on the plant, then come down at them from the top. A: The problem with companion planting in asparagus beds is that the asparagus itself is a very heavy feeder as a plant. Common asparagus beetle larvae are light gray with a black head. 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. The larvae of asparagus beetles excrete a black or brown liquid. 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