Upload
others
View
3
Download
0
Embed Size (px)
Citation preview
Natural Enemies of Vegetable Insect Pests in Hawaii
HOSTS • larvae and pupae of moths, bu3erflies, beetles, and flies
KEY CHARACTER • cocoons on or near the dead host
APPEARANCE • adults range from 1/8 inch to 5 inches including their ovipositor (“s>ng”) • body: tan, brown, or black • wings: may be shaded with blue and brown
VEGETABLE CROPS Several, especially: • sweet corn • cole crops
Hymenoptera: Ichneumonidae
WHAT TO LOOK FOR Ichneumonids pupate inside their host, some>mes in dis>nc>ve striped or colored cocoons. The maggot‐like larvae may be cream or greenish. Look for a single silken cocoon on or near a pest larva or pupa.
Ichneumonid wasp and cocoon on a Diamondback Moth pupa
Ichneumonid wasps are found near the food source of their host pests, primarily:
• vegetable crops
They are also a3racted to sources of available nectar, such as:
• shallow, open‐faced flowers • daisy family flowers • angelica
PESTS ATTACKED Larvae and pupae of: • diamondback moth • cutworms • cabbage maggot
WHAT THEY CAN DO FOR YOU
Top: Cosmos flowers Bo%om: Ichneumonid wasp on a flower
PARASITOIDS Parasitoids are beneficial insects that prey on vegetable pests. Their eggs or larvae are usually found in or on a single insect host. The immature parasitoid develops on or within the host, ul>mately killing the pest when it emerges as an adult. Most parasitoids are wasps or flies.