BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 49 
larvae of the narcissus bulb fly. With each of the three materials, 
ti soaking period of not more than 10 minutes proved satisfactory. 
Other tests indicated that dieldrin may also be effective for this 
purpose. Less satisfactory results were obtained with lindane. 
DDT and toxaphene were ineffective when used in this manner. 
Large-scale tests with chlordane soaks by growers indicated that 
there may be some factors which affect the efficiency of this material in 
controlling the bulb fly, since the results were variable. 
Quick Kill of Mexican Bean Beetles Obtained With Several 
Insecticides 
Malathion proved quite effective in giving a quick kill of moderate 
to heavy infestations of Mexican bean beetle adults that were causing 
severe injury to young beans in an experiment conducted in coopera- 
tion with the North Carolina Agricultural Experiment Station. 
Parathion, methoxychlor, rotenone, isodrin, and CS-T08 also gave good 
protection. 
Insecticides Control Cabbage Aphid 
Dusts containing TEPP or parathion gave good control of the 
cabbage aphid when applied by cabbage growers in South Carolina 
during 1952. In contrast to the previous year's results, no rapid 
rebounds in aphid populations developed in commercial fields after 
an application of either of these insecticides. The infestations 
gradually decreased in all fields under observation and ceased to be a 
menace before harvest began. Systox and a freshly prepared TEPP 
dust were the most effective materials used in field-plot experiments, 
the former showing much longer residual effects. Residue analyses 
by the manufacturer showed no Systox in headed cabbage taken from 
the plots 8 weeks after application. Further studies are necessary, 
however, to determine whether or not there may be any health hazard 
from possible breakdown products of Systox not revealed by present 
known methods of chemical analysis. A parathion dust and TEPP, 
lindane, schradan, and nicotine-soap sprays gave an immediate degree 
of aphid control. Dieldrin and endrin had no apparent effect on the 
aphids. Insect enemies of the cabbage aphid were more abundant, 
and rainfall was higher in 1952 than in the preceding crop season. 
Recommended Procedures Reduce Pickleworm Injury 
Widespread use since 1950 of insecticides, notably lindane, has 
appreciably reduced general populations of the pickleworm and of 
associated melonworm and melon aphid infestations in South Carolina. 
In the Charleston area the pickleworm did not appear in 1952 until 
the middle of May and did not cause serious injury to spring-grown 
cucurbits. Moderate to heavy infestations developed during the sum- 
mer and fall. In general, these were lower than in preceding years. 
Treatments for Onion Maggots Increase Onion Seed Yields 
In an experiment in Idaho to work out a control for the onion 
maggot on onions grown for seed, several insecticides were applied 
to the rows as soil-surface treatments. The applications were timed 
