. Fungoid and insect pests of the farm. Agricultural pests. 162 Aphides and Sawflies [CH. On a plant attacked by aphis may be found among the living forms a number of inflated skins of a whitish colour looking hke small balls. These are the dead lice which have been killed by ichneumon wasps. These little wasps lay their eggs in the bodies of the lice and as the louse grows its parasite also grows and kills it. From the inflated skins the ichneumon wasps hatch out and continue their useful work of keeping down the number of aphides by laying their eggs in Fig. 50. Laoe-wing fly. Eggs. T
. Fungoid and insect pests of the farm. Agricultural pests. 162 Aphides and Sawflies [CH. On a plant attacked by aphis may be found among the living forms a number of inflated skins of a whitish colour looking hke small balls. These are the dead lice which have been killed by ichneumon wasps. These little wasps lay their eggs in the bodies of the lice and as the louse grows its parasite also grows and kills it. From the inflated skins the ichneumon wasps hatch out and continue their useful work of keeping down the number of aphides by laying their eggs in Fig. 50. Laoe-wing fly. Eggs. Two larvae, one with the skins of its victims on its back and one adult. Earwigs eat large numbers of green fUes and also their eggs. Considerable damage is done by aphides in hot dry weather. Rainy weather is unfavourable to their de- velopment. Remedial Measures. It must be borne in mind that a certain number of green flies are killed by other insects. The best means of keeping down these pests is to spray with some solution containing soft soap as a basis. The soft soap. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Petherbridge, Frederick Robert. Cambridge : University Press
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambr, bookyear1916
