Parsnip-Aphid

Includes

Bean aphid (Aphis fabae)
Green peach aphid (Myzus persicae)
Willow-carrot aphid (Cavariella aegopodii)

Pest description and crop damage The willow-carrot aphid is green to greenish yellow. Its primary host is willow, but it feeds on carrots during the summer. The green peach aphid is slender, dark green to yellow, and has no waxy bloom. Infestations may result in wilting. The bean aphid is dark olive green to black with light-color legs. It is usually more of an early-year pest.

Aphids damage plants by sucking plant sap, which causes heavily infested leaves to curl and stunts plants; excreting honeydew, which causes sticky, shiny leaves to turn black because of a sooty-mold fungus growth; and spreading plant diseases such as alfalfa mosaic, tomato yellow top, and zucchini yellow mosaic (a large number of viruses are spread by aphids). Infestations frequently are localized, with heavily infested leaves curled downward.

Biology and life history

See

Management-cultural control

Aphid populations tend to be higher in plants that are fertilized liberally with nitrogen.

Home gardeners can use row covers or wash aphids from plants with a strong stream of water.

Management-chemical control: HOME USE

Apply to both tops and undersides of leaves.

  • azadirachtin (neem extract)-Some formulations are OMRI-listed for organic use.
  • carbaryl
  • cyfluthrin
  • deltamethrin
  • imidacloprid
  • insecticidal soap-Some formulations are OMRI-listed for organic use.
  • pyrethrins-Some formulations are OMRI-listed for organic use.
  • spinosad-Some formulations are OMRI-listed for organic use.
  • zeta-cypermethrin

Management-chemical control: COMMERCIAL USE

  • alpha-cypermethrin (Fastac EC) at 0.02 to 0.025 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 4 days. Do not exceed 0.075 lb ai/a per season.
  • Beauveria bassiana (Mycotrol ESO) at 0.25 to 1 quart/a. PHI 0 days. REI 4 hr (ES) or 12 hr (WP). OMRI-listed for organic use.
  • bifenthrin (Brigade WSB) at 0.08 to 0.1 lb ai/a. PHI 21 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.5 lb ai/a per season.
  • bifenthrin + zeta-cypermethrin (Hero) at 0.04 to 0.1 lb ai/a. PHI 21 days. REI 12 hr. Retreatment interval 21 days. Do not exceed 0.45 lb ai/a per season.
  • borate complex (Prev-Am Ultra) apply 0.8% solution to complete coverage. REI 12 hr. OMRI-listed for organic use.
  • Chromobacterium subtsugae (Grandevo) at 0.6 to 0.9 lb ai/a per 100 gal. PHI 0 days. REI 4 hr. OMRI-listed for organic use.
  • deltamethrin (Delta Gold) at 0.012 to 0.028 lb ai/a. PHI 3 days. REI 12 hr. Retreatment interval 3 days. Do not exceed 0.14 lb ai/a per season.
  • flonicamid (Beleaf 50SG) at 0.062 to 0.089 lb ai/a. PHI 3 days. REI 12 hr. Do not exceed 0.267 lb ai/a per season. Limit 3 applications. Retreatment interval 7 days.
  • flupyradifurone (Sivanto 200SL) at 0.091 to 0.137 lb ai/a. PHI 7 days. REI 4 hr. Retreatment interval 10 days. Do not exceed 0.365 lb ai/a per season.
  • imidacloprid (Admire Pro) at 0.25 to 0.38 lb ai/a soil; 0.043 lb ai/a foliar. PHI 21 days soil; 7 days foliar. REI 12 hr. Do not exceed 0.38 lb ai/a soil or 0.13 lb ai/a foliar per season. Retreatment interval 5 days foliar.
  • imidacloprid (Provado, Prey) at 0.044 lb ai/a PHI 7 days. REI 12 hr. Retreatment interval 5 days. Do not exceed 0.13 lb ai/a per season.
  • malathion (Malathion 8) at 1.25 lb ai/a. PHI 7 days. REI 24 hr. Retreatment interval 7 days. Limit 3 treatments per year.
  • sulfoxaflor (Transform WG) at 0.023 to 0.047 lb ai/a. PHI 7 days. REI 24 hr. Limit 4 treatments. Do not exceed 0.266 lb ai/a per year.
  • thiamethoxam (Actara) at 0.023 to 0.047 lb ai/a. PHI 7 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.125 lb ai/a per season.
  • thiamethoxam (Platinum) at 0.078 to 0.188 lb ai/a. REI 12 hr. Do not exceed 0.188 lb ai/a per season. Apply to the soil as in-furrow spray, band application, drench, shanked or with irrigation.
  • zeta-cypermethrin (Mustang) at 0.04 to 0.05 lb ai/a. PHI 1 day. REI 12 hr. Do not exceed 0.3 lb ai/a per year.