BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 6 
Stored-product insects — Continued Pa se 
Insecticides show no repellency to tobacco insects 37 
DDT-plastic treatment protects animal hair padding 37 
Low concentrations of insecticides protect fabrics 37 
Comparative toxicity of three insecticides to black carpet beetle 
determined 38 
Commercial mothproofing sprays effective 38 
Treated rug still protected after 18 months' use 38 
Treatments for quarantined plants tested 38 
Insect repellent glues protect sealed cartons 39 
Infested shelled corn successfully treated with insecticidal aerosol 39 
Corn sprayed for corn earworm shows less rice weevil 39 
Fumigants applied by remote control 39 
Cowpeas fumigated under tarpaulins for weevil control 39 
Fumigants may affect germination in high-moisture-content cowpeas 
and beans 39 
Forest insects 40 
Characters symptomatic of tree suspectibility to pine beetle attack 
determined 40 
Benzene hexachloride controls turpentine beetle on pines 40 
Selective tree removal reduces damage by western pine beetle 40 
Bark beetles controlled at lower costs #? 40 
New device improves spray distribution from helicopter 41 
Sprays tested for control of several destructive forest insects 41 
Means of recognizing incipient infestations of spittlebugs found 41 
Oleoresin content may affect pine resistance to insect attack 42 
Several treatments effective in protecting wood products from attack 
by powder post beetles 42 
New developments in preventing termite attack 42 
Natural parasites survive DDT spraying for spruce budworm control . 43 
Better methods of aerial detection of forest insect infestations devel- 
oped 43 
Higher altitudes specified for aerial spraying for spruce budworm 
control 43 
Fifth instar spruce budworm larvae most vulnerable 44 
Gypsy-moth control campaign progresses 44 
Extensive acreage sprayed to control gypsy moth 44 
Bait-lure material collected in Portugal 44 
Substantial increase in gypsy moth infestation found 45 
Further simplifications in certification procedures 45 
In sect Identification 45 
E u ropean insect parasite introductions 46 
Native parasites collected for shipment abroad 46 
Widespread destruction of Klamath weed by insect predator 46 
Honey bees and other pollinating insects 47 
Wide variation in honey production among bee progeny 47 
Free-flying drones best for laboratory breeding purposes 47 
Bee colonies survive prolonged low temperatures 47 
Time-saving technique for diagnosing foulbrood developed 48 
Hybrid queens produce colonies highly resistant to American foul- 
brood 48 
Pollinators of cotton blossoms in Arizona identified 48 
Honey bees affect cotton flower development 49 
Huge numbers of bumble bees assist in pollinating red clover 49 
Competitor plants reduce effectiveness of bees as red clover pollinators _ 49 
Improved harvesting methods necessary to reap benefits of bee-polli- 
nated red clover 1 49 
Insect pollinators of alfalfa vary with the locality 49 
Alfalfa pollen varies in attractiveness to bees 50 
Fewer bees needed for alfalfa pollination in absence of competitor 
plants 50 
Cotton insects 50 
Pink bollworm control and research activities 50 
Widespread dispersion of pink bollworm poses serious threat 50 
Greater emphasis given to pink bollworm research problems 54 
Many Florida localities freed of wild cotton host plants 55 
Less boll weevil damage to cotton crops 55 
