Larval feeding continues for 10 to 14 days at which time, larvae migrate to the soil and pupate. This has the effect of knocking the larvae to the ground. Both stages of this insect feed on asparagus stems and the resulting damage will turn the stem brown/dead above the point of feeding The beetles feed as soon as they emerge and several days later egg laying begins. While spears are developing and after harvest as ferns grow on: Knock beetles, larvae, and eggs from spear and plants with a strong stream of water. Remove weeds, dead and dying plant debris. chamomile Pesticide control Large plantings, where hand removal is not feasible, can be sprayed with the organic contact insecticide pyrethrum (e.g. Pest & Disease Control for Asparagus Plants Crown & Spear Rot. During summer months stunted, light yellow... Purple Spot. what to do to get rid of asparagus beetles which leave black spots on the asparagus. A rule of thumb is that if you spot an adult beetle on 1 in 10 plants or larvae on 50 to 75 percent of the plants, you should use some kind of control. Cover your patch with garden fabric until harvest ends. Asparagus beetles are a disgusting problem for people who grow asparagus. Spotted Asparagus Beetle. Grow asparagus a safe distance from places suitable for beetle hibernation. If you have an asparagus patch, keep an eye out for the highly destructive asparagus beetle starting early in summer (if not sooner). Asparagus beetles undergo a physiological process to prepare their bodies to withstand freezing temperatures during winter. You should also wipe away any eggs you see either on the spears or on the leaves of the ferns later in the season. If you’re growing asparagus in your home garden, the asparagus beetle is a pest you will be all too familiar. 1 Response. A method for larval control in small gardens is to brush the plants with a broom. Now that we have a thriving asparagus patch, our garden has exactly what this annoying pest most desires. Keep spears harvested to reduce the opportunity for egg-laying. In small patches handpicking can control asparagus beetles. Both adults and larvae can also be removed by hand and dropped into a bucket of water. Control begins with keeping a clean area where you grow asparagus. repels flies, including mosquitoes the carrot fly, asparagus beetles and whiteflies: borage: repels tomato hornworm and cabbage worms: castor bean: repels moles: catnip: repels ants, flea beetles, aphids, the Japanese beetle, squash bugs, weevils, the Colorado potato beetle, the cabbage looper, and cockroaches. As a result, chemical control is rarely necessary. The species Crioceris asparagi is more commonly known as the asparagus beetle, and it is quite similar to the species Crioceris duodecimpunctata, also known as the spotted asparagus beetle.You may find either of these species damaging your asparagus plants, although the asparagus beetle is more commonly a problem. Avoid spraying when asparagus or crops in neighboring fields are flowering. Common asparagus beetle. This annoying insect is about half a centimeter long and is a metallic bluish-black color with white or yellow spots on its back. Once asparagus fronds turn yellow, cut them off at or just above soil level. Asked May 11, 2016, 5:50 PM EDT. Appearance. Cover new spears with poly row covers to exclude beetles. 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. Look out for the beetles in the afternoon when they are most active. Biology. Adults are slightly larger than common asparagus beetles. While it’s generally recommended that you use these options in … Here are some suggestions from MSU Extension that may help control asparagus beetles during harvest: Time sprays to have fresh insecticide residue on spears in the afternoon. July 2, 2014. Appear as soft water-soaked lesions on shoots and at soil line, or slightly above or below. Safer ® Brand offers a variety of asparagus beetle control and insect killer products to help control and eliminate this garden pest and revive your plants. Plant an intercrop of calendulas, nasturtiums, or tomatoes which also seem to repel beetles. Adult asparagus beetles are up to 8mm long. How To Identify and Control The Asparagus Beetle. Collect and destroy berries for spotted asparagus beetle control. I tried picking off the beetles and putting them in soapy water to kill them. 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