![]() ![]() A generalized description is shown in Fig. The life cycle of aphids can be complex, and differs among species. Summer: vegetables - broccoli, cauliflower, cabbage, Brussels sprouts, kale, collards, kohlrabi, oilseed rape, Chinese broccoli, Chinese cabbage, radish, kale and weeds - Indian mustard, white mustard, black mustard Plant Hosts: Fall – Spring: cole crop residue, weeds Summer: vegetables - cantaloupe, honeydew, casaba, Persian melon, watermelon, cucumber, squash, pepper, asparagus, eggplant, okra other crops - cotton, citrus and weeds - milkweed, jimsonweed, pigweed, plantain, field bindweedĭescription: Gray to green with a grayish waxy covering and short cornicles. Plant Hosts: Fall - Spring: catalpa, rose of Sharon Summer: vegetables & fruit - potato, tomato, eggplant, sunflower, pepper, pea, bean, apple, turnip, corn, sweet potato, asparagus and weeds - ragweed, lambsquarters, jimsonweed, pigweed, shepherd’s purse, wild lettuce, cloverĭescription: Mottled light and dark green or almost black however, yellow forms do occur. ![]() Plant Hosts: Fall - Spring: wild and ornamental rose Summer: vegetables - tomato, potato, pepper, eggplant, squash, pumpkin, cucumber, spinach, mustards, cabbage, broccoli, legumes, celery, okra, corn other crops - tobacco, canola, sunflower, other flowers and weeds - lambsquarters, common tumbleweed, nightshade, sowthistle, mustards, many othersĭescription: Pink or green 0.07 to 0.16 in (1.8 to 4.1 mm) long. Plant Hosts: Fall - Spring: peach, apricot, nectarine 3).ĭescription: Yellow to green in summer vary from pale to dark-green, pink, or red in fall. The winged form of the green peach aphid has dark spots on its green body (Fig. Winged forms generally have slimmer bodies and transparent wings. Nymphs develop through about four molts before becoming adults.Īdult aphids can be winged or wingless (apterous). As nymphs feed and grow they molt, casting off white skins (exoskeleton) that can be seen near the colony (Fig 2). Juvenile aphids (nymphs) look like adults, except smaller in size (Fig. This fact sheet will focus on four of the most common aphids that are pests of vegetable crops in Utah:Ĭabbage Aphid (Brevicoryne brassicae) DescriptionĪphids are small, soft-bodied, pear-shaped insects with two tailpipe-like appendages called “cornicles.” Cornicles are unique to aphids, and excrete defensive compounds (waxes and alarm pheromones).Īphids vary in color, including within species, depending on maturity, food source, genetic lineage, and their environment. Insecticidal soap or horticultural oil sprays can reduce aphid populations and conserve natural enemies.Īphids are a diverse family of insects with many species that inflict similar plant damage, and can be managed using similar tactics.Biological control from predators and parasitoids is a key contributor to suppressing aphid populations.One of the most serious problems caused by aphids to vegetable crops is the spread of plant viruses.During spring and summer, aphids can be abundant.Aphid feeding distorts and stunts plants, produces honeydew that supports sooty mold fungi, and can vector plant viruses.Aphids are small, soft-bodied insects that suck sap from plant tissues.16. This color-aphid has been infected and killed by the entomopathogenic fungus Beauveria bassiana. 15. Parasitic wasps parasitize aphid bodies turning them dark in color (upper left) a wasp pupates within the aphid body, turning it into an enlarged mummy (upper right) and a new adult wasp emerges from the aphid leaving an exit hole in the hold aphid body (bottom).įig. 14. Aphid predators include: damsel bug (top left), syrphid fly larva (top right), predatory midge (bottom left), and lacewing larva (bottom right).įig. 13. Lady beetle adults often lay eggs (left) near aphids so that larvae (right) will have food available when they hatch.įig. Mosaic virus symptoms can also occur on fruits, such as squash (right).įig. ![]() 12. Mosaic virus symptoms on a pumpkin leaf (left). 11. In non-persistent transmission, aphids need only very short feeding times (usually fom tissues near the surface of leaves) to obtain the virus on their mouthparts.įig. Aphids also feed on stems (boom left) and fruit (bottom right).įig. 9. Aphid infestations can cause leaves to curl (top lefT) and/or become yellow (top right). 7. Cabbage aphids (Brevicoryne brassicae)įig. Potato aphid (Macrosiphum euphorbiae)įig. 4. Green peach aphid (Myzus persicae)įig. 3. Winged form of an adult green peach aphid.įig. When aphids molt, white "skins" are left behind.įig. 1. A green peach aphid giving birth to live young (vivipary).įig. ![]()
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