They have a significant waxy covering and short cornicles. Moran N. 1992. Austral Entomology. No person should act on the basis of the contents of this publication without first obtaining independent, professional advice. Day MF and Irzykiewicz. Lifecycle, critical monitoring and management periods for the cabbage aphid (Source: cesar and QDAFF). Let us look us how these cabbage pests … DAMAGE When populations are heavy, green peach aphid can stunt seedlings; however, economic damage rarely occurs on older plants because green peach aphids tend to feed on older leaves and rarely enter heads of broccoli, cauliflower, cabbage, or Brussels sprouts. Symptoms of a cabbage aphid infestation. For disease-prone areas, regular aphid monitoring from autumn onwards is recommended to detect aphids moving into crops, particularly along paddock edges. In India, mustard is especially susceptible with instances of over 90% reduction in yield. See, This article was compiled by Paul Umina (, PestNotes are information sheets developed through a collaboration between, http://cesaraustralia.com/assets/Uploads/wingedaphids.pdf. ), with serious outbreaks occurring only sporadically. The former is the most common and prefers the cooler season, although it is not confined to it. Small colonies of aphids can be effectively controlled by predators such as ladybird beetles, syrphid fly larvae, and lacewing larvae. Although, D. rapae is a very common parasite, it is not always effective in controlling aphid populations. Cabbage aphids cause indirect damage by spreading plant viruses. Aphids on the underside of leaves on a currant bush. Pirimicarb has little impact on beneficial insects compared with broad-spectrum chemicals. The green peach aphid feeds on over 300 species of plants and does not cause serious damage on cole crops. Also, D. rapae itself may often be killed by hyperparasites. Thresholds for managing aphids to prevent the incursion of aphid-vectored virus have not been established and will be much lower than any threshold to prevent yield loss via direct feeding. Australian Journal of Experimental Agriculture 48: 1523-1530. Consider the populations of beneficial insects before making a decision to spray, particularly in spring when these natural enemies can play a very important role in suppressing aphid populations if left untouched. Numbers of cabbage aphids in canola crops are on the rise in some regions as temperatures gradually become warmer. Cabbage aphids are one of several aphid species that can be problematic in canola crops. Department of Entomology1980 Folwell Avenue | St. Paul, MN 55108-6074(612) 624-3670 | contact Bill Hutchison hutch002@umn.edu. Imported cabbageworm damage is similar to cabbage looper injury. GPA overwinters as an egg on peach or stone fruits; however, the degree to which GPA can consistently overwinter in the Midwest is unknown. 2003. Conventional insecticides applied for the Lepidopteran pest complex will also usually suppress aphid populations. When plants become unsuitable or overcrowding occurs, the population produces winged aphids (alates), which can migrate to other plants or crops. The cabbage aphid is an introduced and widespread pest of canola, with peak abundance typically in spring. The cabbage aphid feeds on wild and cultivated cruciferous crops including cabbage, collards, broccoli, brussel sprouts, cauliflower, kale and radish. turnip yellows virus), chlorotic ring spots and mottling for CaMV and yellow mosaic patterning and tip necrosis for TuMV. However, wingless females producing live young (nymphs), are the most common. , Jacob HS and Berlandier F. 2006 although cabbage aphid damage is critical to consider several other before. 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