THE Effectiveness of anthocoris nemorum and a. confusus (hemiptera: anthocoridae) as predators of the sycamore aphid, drepanosiphum platanoides: 1 the number of aphids consumed during development
1970
RUSSEL, R.J.
Nymphs of Anthocoris nemorum and Anthocoris confusus were reared in the laboratory, using the sycamore aphid Drepanosiphum platanoides as food. Most of the food required for development is consumed during the last three instars. Individuals which developed in the shortest time consumed least food during development, and weighed least at maturation. Comparison of the weights of field and laboratory reared animals indicates that they consume similar amounts of food during development, and the number of sycamore aphids required for development in the field is estimated. It is suggested that under natural conditions, the number of anthocorids which reach maturity is dependent upon the number of young aphids available during the early stages of the anthocorids' development.
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