Abstract
The percentage of parasitism in cotton fields is apparently too low to exercise any adequate control ofPempheres. Their numbers are extremely insufficient for the purpose. The host-parasitic ratio is capable of being improved by artificial multiplication and timely liberation of at least one species—Spathius critolaus. Beneficial results may follow this procedure. The more promising line of action, however, is to introduce into cotton fields the parasites of its pre-economic habitat by direct importation of parasitised material as also by laboratory breeding and manipulation, should the species prove amenable in this regard. Success in this or any similar project can never be assured. Attempts in these directions are desirable.
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