Six Spotted Leafhopper
The six spotted leafhopper carries the disease aster yellows. The small, green insect has six spots on the front of its head. Spray with Diazinon(10).
Green Peach Aphid
This light green insect sucks plant juices causing plants to be stunted and malformed. Use sprays of Diazinon(10) Pyrethrin(0) or Rotenone(1).
This long snouted, brown insect with black speckles feeds on plants in the spring and lays eggs in the leaf stems. The larvae hatch and move down to the crown to pupate. The second generation emerges in mid-July. The third generation adults emerge in mid to late September and overwinter. No chemical control is listed.
This insect overwinters as larvae and pupae. The adults emerge in mid to late May and lay eggs. The larvae hatch out in early June and are variable in color, but have buff- brownish stripes down the side. They feed on the foliage and stalks near the plant heart. The damage is usually not noticed until early July. There are 3 generations per year. Cutworms can be controlled with Diazinon granules.
Looper adults are active from late April until early May and throughout the season. Eggs are deposited on the leaves from which larvae hatch and feed on the foliage. The light green larvae have a white stripe down the sides and back and hump up when they move. There are 4 to 5 generations per year. Sprays of Bacillus thuringiensis(0) control this pest. Other choices are Methoxychlor(0) or Pyrethrin(0).
Celery Leaf Tier
This greenish 3/4 inch long worm eats holes in the leaves. It rolls and folds leaves then webs them together. No chemical is listed.
Yellows is spread by leafhoppers. Infected plants have yellow leaves and are stunted. There is no chemical control for yellows.