Abstract
In response to internal parasitization by Banchus flavescens Cresson, larvae of the cabbage looper and, to somewhat lesser degrees, larvae of the celery looper and the alfalfa looper, form a bubble-like cyst between the cuticle and epidermis on the dorsum of the penultimate segment. Larvae of the flax bollworm and the clover cutworm do not respond in this way; rather, they promptly and effectively encapsulate the parasites within their haemocoele. The stimulant for cyst formation in the loopers seems to be produced by the acid (= poison) accessory gland of the female wasp; this same secretion(s) serves to protect the parasite from haemocytic encapsulation.
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