hymenoptera: hosts ichneumonidae what to look for key character

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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

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Page 1: Hymenoptera: HOSTS Ichneumonidae WHAT TO LOOK FOR KEY CHARACTER

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 

Page 2: Hymenoptera: HOSTS Ichneumonidae WHAT TO LOOK FOR KEY CHARACTER

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.