Their edible heads—like the sprouts on a brussels sprout plant—may appear damaged, stunted, or sickly. An adult root maggot (known as a cabbage fly, cabbage root fly, root fly or turnip fly) looks like a housefly, while their maggots are white or white-yellow grubs that are approximately 0.3 inches long, tapering toward the head. They fly around cabbage plants during the day. Since aphids can reproduce without mating, their populations can grow quickly, especially when the temperature is warm. Cabbage loopers feeding on the underside of a collard leaf. Plant oil and fatty acid products are less likely to affect larger insects such as ladybird adults. B.t. It is often found on the lower leaves before spreading all over the plant. In 2016, we evaluated three different strategies to manage cabbage aphid in Brussels sprouts: 1) nothing, 2) organic insecticides, and 3) interplanting with a mix of flowers. When mature, larvae are about 1¼-inches (3.2 cm) long. Flies are attracted to fields which are high in decomposing organic matter, i.e., fields recently turned, new ground, weedy areas or fields recently treated with postemergence herbicides. The potato aphid is the least important of the three aphid species. This information is supplied with the understanding that no discrimination is intended and no endorsement of brand names or registered trademarks by the Clemson University Cooperative Extension Service is implied, nor is any discrimination intended by the exclusion of products or manufacturers not named. Randall P. Griffin, PhD, Emeritus Faculty, Entomology, Clemson University, Joey Williamson, PhD, HGIC Horticulture Extension Agent, Clemson UniversityZack Snipes, Horticulture Program Team, Beaufort and Charleston County, Clemson Extension. Large larvae are heavy feeders and may cause serious damage to cabbage heads especially when numerous. Declare insecticide controls a wide range of insects on numerous row and specialty crops. broccoli heads at harvest are cause for rejec- tion of the crop by processors and fresh market buyers. The cabbage maggot can be controlled by cultural means. Larval webworms are about ½-inch (1.27 cm) long when mature. Table 1. Eggs are laid in clusters, and large numbers of the larvae hatch on individual plants. aphid in the UK. Cabbage aphid Brevicoryne brassicae (L.) (Hemiptera: Aphididae) is a serious pest of crucifers in Pakistan. Each is about the size of a pinhead. Zachary Boone Snipes, ©2015, Clemson Extension. Clemson University Cooperative Extension Service offers its programs to people of all ages, regardless of race, color, gender, religion, national origin, disability, political beliefs, sexual orientation, gender identity, marital or family status and is an equal opportunity employer. Bug Clear Gun for Fruit & Veg, Neudorff Bug Free Bug and Larvae Killer), fatty acids (e.g. Provanto Ultimate Fruit & Vegetable Bug Killer, Provanto Sprayday Greenfly Killer). The cabbage aphid feeds only on plants in the Cruciferae family (cole crops, mustard, etc. In a vegetable garden, Bacillus thuringiensis adequately controls cabbageworms. They suck plant sap from the leaf. Imported cabbageworm damage is similar to cabbage looper injury. We hypothesized that mixing flowers in with the Brussels sprouts would provide some control of cabbage aphid levels on the sprouts by attracting insect enemies of the aphid. Resistance status of aphid pests of oilseed rape crops . (see Control of Cole Crop Insects section) works very well. Cabbage webworms tunnel into and kill the buds of young plants. 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