Green peach aphids can attain very high densities on young plant tissue, causing water stress, wilting, and reduced growth rate of the plant. Colony of green peach aphids. Destroying weed hosts late in the year may help destroy overwintering populations. Sooty mold may develop where excessive honeydew is … Stippling, chlorosis, and leaf curling are other symptoms displayed by host plants. Don’t allow them to crawl up into the develop broccoli florets. You will need a hand lens to see the cornicles. Among the more common predators are lady beetles and their larvae, lacewing larvae, and syrphid fly larvae. For questions or feedback about our college or website, please Contact Us. The Cabbage Aphid can cause significant economic loses in broccoli grown in the Willamette Valley (Figure One). Aphid colonies are present year round on roots of host trees. This aphid moves into melon fields in large numbers from surrounding vegetation, carrying viruses as it moves and feeds from one plant to another. Damage. Here is how to tell them apart. Professional field scouts will cross a broccoli planting and pull leaves from every row. Cultural Control: Where possible, incorporate infested crops immediately after harvest to prevent dispersal. Sprays applied for green peach aphid will also control black peach aphid. Therefore it is important to alternate applications between products with different Group Numbers to avoid development of resistance to any chemical group. They can attain high densities on younger plant tissues which may lead to water stress, wilting, and a reduced growth rate. Green peach aphids do not crawl up into the developing broccoli florets. This hold is where the mature wasp escapes after the wasp larva has mined out the hollow aphid body. Chemical Control: Please consult the PNW Insect Management Handbook for pesticide recommendations. Nymph – Green peach aphid nymphs resemble wingless adults in colour but are smaller (Fig. The body varies in color from pink to green with three darker stripes down the back and the head supports long antennae and red eyes. In canola, direct damage by green peach aphid can occur during autumn and early winter, and occasionally during spring. Black peach aphid: both wingless and winged forms are shiny black in colour. Accessed December 9, 2011. Preserve the many predatory insects that feed on aphids by avoiding use of harmful chemicals where possible. After 2-3 generations, winged forms emigrate in June to produce several generations on summer hosts. Adult cabbage aphids overwinter on crops or weeds. Biological Control: Many parasites and predators attack aphids. Extensive feeding causes plants to turn yellow and the leaves to curl downward and inward from the … This is why the cabbage aphid is such a problem in broccoli. This helps to identify the cabbage aphid and distinguish it from other aphids that may encounter on broccoli and cauliflower. After several generations, winged adults fly to new host trees. Leaves infested with green peach aphids. Additional symptoms which may also result are distorted and curled leaves, Early season infestation is particularly damaging to potato, even if the aphids are subsequently removed (Petitt and Smilowitz 1982). The cabbage aphids are waxy and grayish; the green peach aphids are green, not waxy. Black peach aphid – overwinters as wingless adults on roots of host trees. The cabbage aphid contaminates the harvested heads of broccoli. The genus of the cabbage aphid is “Brevi” “coryne” which is from Latin and loosely translates as “small pipes”. These winged aphids blow across the landscape and infest crucifer plantings. Once the aphids have moved up into the developing broccoli head, it is possible to kill them, but it is no longer possible to remove them as a contaminant. Aphids spread viruses between plants by feeding and probing as they move between plants within or between paddocks. Do not use Purespray Green Spray Oil 13E within 14 days before or after captan or sulphur applications. There are several species of parasitic wasps that produce aphid mummies. (Ed.). Pacific Northwest Insect Management Handbook. 3). In desert areas, Watermelon mosaic virus, Zucchini yellow mosaic, and Papaya ringspot virus are transmitted chiefly by the green peach aphid. Green peach and black peach aphids mainly attack peach; however, apricot, plum, cherry and other trees may be attacked. Green peach aphid - infestations on blossoms and new shoots cause flowers and leaves to curl tightly and shoots to stop growing (Fig. The feeding of the aphid on the broccoli plant may reduce yield slightly, but the real damage it causes is contamination. Corvallis, Oregon 97331. They are generally not a significant contaminate of broccoli and generally do not required insecticide for control. Females produce live offspring though out the entire year without mating. Green peach aphid also attacks a wide variety of vegetable and floricultural crops. In addition, it can also damage the plant by sucking plant sap. It forms dense colonies or clusters on the leaves. On most aphids, the cornicles are relatively long and stick out from the body. Aphid feeding compromises the plant’s structural integrity and young plants may of-ten experience water stress and premature wilting. Sooty molds sometimes grow in the honeydew. Early summer above ground damage similar to green peach aphid. http://insects.ippc.orst.edu/pdf/reb25.pdf, http://insects.ippc.orst.edu/pdf/reb23.pdf. (http://www.ipm.ucdavis.edu/PMG/r108300811.html). Inspect trees before bud burst for aphids on emerging leaves. Oregon State University. Infestations start when winged aphids fly into crops from autumn weeds, with heavy infestations causing leaf distortion, wilting of cotyledons, leaf … The cabbage aphid contaminates the harvested heads of broccoli. Pacific Northwest Insect Management Handbook. Green peach aphids are responsible for transmitting several viruses to vegetable crops. The Cabbage Aphid can cause significant economic loses in broccoli grown in the Willamette Valley (Figure One). Prolonged aphid infestation can cause appreciable reduction in yield of root crops and foliage crops. Adult aphids may be winged (alate) or wingless (apterous). Although damage per aphid is often not serious, these aphids reproduce so rapidly that serious harm can be done in a short time. 1). Accessed December 8, 2011. Pull 10 broccoli leaves in 10 different spots of the field and record what you observe. Some adults move up trees to establish colonies on leaves and shoots which usually disappear by midsummer. Green peach aphids can attain very high densities on young plant tissue, causing water stress, wilting, and reduced growth rate of the plant. "Green Peach Aphid Factsheet". One can get a rough sense of aphid pressure with the 10 x 10 method. (http://insects.ippc.orst.edu/pdf/reb23.pdf). Damage. (http://insects.ippc.orst.edu/pdf/reb25.pdf). But the aphids mostly damage crops by contaminating them. Authors: Pamela Opfer and Dan McGrath, OSU Dept. In general, aphids cause damage by sucking plant sap, which causes heavily infested leaves to curl and stunts plants.
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