The cellular responses of migratory grasshoppers ...

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Title The cellular responses of migratory grasshoppers (Melanoplus sanguinipes F.) and African desert locusts (Schistocerca gregaria L.) to Diplotriaena tricuspis (Nematoda: Diplotriaenoidea)
Author(s) Richard J. Cawthorn
Date 1980
Volume
Issue
Abstract In further laboratory studies in Canada [see preceding abstract], 12 h after infection 1st-stage larvae of Diplotriaena tricuspis had hatched, penetrated the gut wall, and entered the fat-body of the grasshopper Melanoplus sanguinipes (F.) and the locust Schistocerca gregaria (Forsk.). Capsule development was similar in both insects. Capsules, which had fibrous walls and contained both normal and degenerating adipocytes, developed at least as early as 4 days after infection. Capsules were well developed when the 3rd stage was reached. The fibrous wall probably resulted from conversion of adipocytes to fibrous tissue. Larvae apparently had a readily available source of food (adipocytes) and were protected from the haemocytic response of the insects by the capsule wall. Larvae were not destroyed by haemocytes or melanisation. Few larvae developed free in the haemocoel.ADDITIONAL ABSTRACT:Twelve hours after infection first-stage larvae of Diplotriaena tricuspis had hatched, penetrated the gut wall, and entered lobules of the fat body of grasshoppers (Melanoplus sanguinipes) and locusts (Schistocerca gregaria). Capsule development was similar in grasshoppers and locusts. Capsules, which had fibrous walls and contained both normal and degenerating adipocytes, developed at least as early as 4 days after infection. Capsules were well developed when the 3rd stage was reached. The fibrous wall probably resulted from conversion of adipocytes to fibrous tissue. Larvae apparently had a readily available source of food (adipocytes) and were protected from the haemocytic response of the insect by the capsule wall. Larvae were not destroyed by haemocytes or melanization. Few larvae developed free in the haemocoel. [AS].

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