Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools . elementaryprinci02ferg Year: 1913 Fig. 113. A, dead ' green bugs,' showing hole from which the matured parasite emerges. The top figure shows the lid still attached, but pushed back; the bottom figure shows the parasite emerging; B, principal parasite of the spring grain-aphis or 'green-bug;' adult female, highly magnified. After Webster, United States Depart- ment of Agriculture. parasite are most often deposited in caterpillars, though sometimes in the chrysalis, pupa, or on tne
Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools . elementaryprinci02ferg Year: 1913 Fig. 113. A, dead ' green bugs,' showing hole from which the matured parasite emerges. The top figure shows the lid still attached, but pushed back; the bottom figure shows the parasite emerging; B, principal parasite of the spring grain-aphis or 'green-bug;' adult female, highly magnified. After Webster, United States Depart- ment of Agriculture. parasite are most often deposited in caterpillars, though sometimes in the chrysalis, pupa, or on tne adult stage, or even in the eggs of their hosts. Entomologists formerly thought that each kind or species of parasitic insect secured its food from just one or two kinds of hosts, somewhat similar to that noticed in the parasitic fungi previously mentioned (^[217). Recent investigations have shown that there is much less restriction in feed- ing habits among parasitic insects than was formerly L
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