Colo. 
Del. 
oe 
The Biology and Control of the Khapra Beetle. Make compre- 
hensive study of Khapra beetle, including facets of its biology, 
ecology, normal and abnormal physiology and devise control 
measures for protection of stored products. (1) Biology. Rela- 
tion of temperature to development of eggs, larvae, pupae and 
adults—-life history studies of temperatures from 50-110, 
investigate thermal death point, effects of low temperatures 
above and below freezing; effect of light conditions and intensi- 
ties on life cycle at various temperatures; continue studies on 
food preferences, length of survival of various life-stages in 
absence of foods; factors influencing oviposition sites of females. 
(2) Physiology. Investigations of possible diapause in overwinter- 
ing larvae, movlting and metamorphosis, nutrition of larvae to 
gain insight into food range and limitations thereof. (3) Control. 
Studies will be conducted to determine effectiveness of various 
chemical controls as: studies with fumigants, studies with contact 
insecticides, studies with stomach poison insecticides, studies 
with attractants and repellents—-with physical agents, mechanical 
barriers, trapping devices, inert materials as deterrents, and 
with radiant energy. 
Ent. 1671 (WM-16) Coop. AMS 
Maintaining Marketability of Wheat in Farm Storage and Count 
Elevators Through the Control of Insects. To (1) obtain technical 
data on distribution, infestation, reservoirs, and conditions favor- 
ing high population densities of principal species of insects affect- 
ing marketability of wheat on farm and in country elevators; (2) 
determine value of various commercial protectants and fumigants to 
improve marketability of grain under farm storage; (3) study role 
of lesser grain borer as a factor in lowering quality and market- 
ability of wheats and (4) determine effect of insect damage in 
terms of economic loss to farmers and estimate increased returns 
from use of protective treatments. 
Ent. 217 (WM-16) 
Biology and Control of the Clover Mite, Bryobia Praetiosa 
Koch, in Delaware. (1) Fill in obscure portions of life history 
of mite as overwintering stages and habitat, favorite host plants 
for feeding and egg deposition and length of various stages. (2) 
Test by lab. and field methods effectiveness of recently-developed 
miticides and re-evaluate under local conditions the older 
miticides. 
Ent. 7-E 
