Pesticides must be applied legally complying with all label directions and precautions on the pesticide container and any supplemental labeling and rules of state and federal pesticide regulatory agencies. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Criticism of products or equipment not listed is neither implied nor intended. The information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. 12 to 24 hour reentry proposed.Ī botanical insecticide that is allowed for use in Colorado Certified Organic production. The 80S, 4F, and 5OW formulations are highly hazardous to bees. (3 days) A carbamate insecticide (carbaryl). Chlorinated hyrdrocarbon insecticide (endosulfan) (7 days) Some rotational restrictions with root crops. Product List for Harlequin bugs: Insecticide
If harlequin bugs are controlled with insecticides, however, natural enemy populations of other more important pests, such as aphids and caterpillars, will be disrupted. Harlequin bugs are subject to attack by some predators, but have developed effective chemical defenses of their own. The cabbage varieties Copenhagen Market 86, Headstart, Savoy Perfection Drumhead and Early Jersey Wakefield the cauliflower varieties Early Snowball X and Early Snowball Y, and radish varieties White Icicle, Globemaster, Cherry Belle Champion, Red Devil and Red Prince have all been recognized as resistant to harlequin bugs. Other cover, such as vegetation near field edges should be reduced to minimize overwintering success. Harlequin damage is more likely after mild winters.Ĭrop residue should be destroyed immediately after harvest to reduce local populations. Plant tissue around the feeding sites often turn cloudy. If young plants are fed on, the growth is distorted and slowed, and the growing point may die. Harlequin bugs feed by sucking sap from crucifers. Unless the weather remains unseasonably warm, only one generation occurs per growing season. After hatching, harlequin bug nymphs usually remain on the same plant, feeding for about two months before becoming adults. They move into crop stands by early summer, and begin to lay eggs on leaves. They become active in mid-spring and begin the feed on wild crucifers. Harlequin bugs overwinter mostly as adults in our area, hiding under crop residue and in other protected sites. Harlequin bugs smell bad at all life stages. The triangular plate on the top of the thorax is black with a cross shaped mark of red in the center. Harlequin bugs are shield-shaped flat bugs, easily identified because of their bright, shiny black and red coloration. Identification (and life cycle/seasonal history) 1 Identification (and life cycle/seasonal history).