2 I ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE, 1 
methoxycblor and in New Jersey chlordane and toxaphene were not 
promising. 
Light infestations of the pear thrips on prunes in Oregon were 
controlled with parathion and with DDT both when applied to the 
ground before trie overwintering adults migrated to tne ti 
later when applied to the trees. For application to the ground para- 
thion was used as 0.5-, 1-, and 2-percent dusts and in sprays containing 
2 pound- of L5-percen1 material per LOO ir-i 1 1« >i s; ai d DDT was used 
as a spray ;it 2 quarts of a 25-percent emulsion concentrate per LOO 
gallons. For application to the trees, sprays containing 1 ',. %, or 1 
1 of L5-percent parathion per LOO gallons or 25-percenl emul- 
sible oil. 1-800, or dusts containing 0.5 or 1 percent of parathion or 
5 percent of DDT were used. The -prays were applied to the trees 
when most of the green tips were showing in the blossom buds, the 
dusts 1 week later. 
Effect ive control of ilic -lint -hole borer in Washington was obtained 
with 2 pound- of 50-percenl DDT or 1 pound of 25-pero nt parathion 
or benzene hexachloride (12-percent gamma) per LOO gallons when 
applied in t ime to kill the adults as they emerged. 
Pecan insects 
In tests against the hickory shuckworm on pecans in Georgia and 
Florida, both DDT and parathion reduced the number of premature 
drops by about 50 percent The effect on the final yield, however, was 
masked by crop Losses due to excessive rainfall and scab. 
For control of the pecan nut casebearer a mixture of DDT and 
tank-mix nicotine bentonite gave the best results and also the greatest 
yield of nuts in Texas, but both parathion and toxaphene also .-bowel 
promise. In northern Florida DDT at 2 pounds of 50-percent wet- 
table powder reduced the nut casebearer infestation by v "> to 90 per- 
cent. The trapping of mature larvae, found promising as a means 
of timing spray applications in Texas, did not work out well in 
Florida. It was found, however, that the residual effectivenes 
DDT will permit considerable latitude in the timing of sprays, since 
single applications made on different dates in comparable blocks 
during a 13-day period were about equally effective. 
DDT continued to rive good control of the pecan weevil in Texas 
and Georgia, and in Texas parathion and chlordane were found of 
value in preliminary test s. 
Studies of the shoot curculios in Louisiana indicated that in good 
crop pears the set of nuts is influenced more by cultural practices 
than by the attack of these insects, in L948, when bloom was heavy, 
severely infested trees that were uncultivated set poor crops of nuts, 
whereas similarly infested trees that were cultivated set fair to good 
crop-. Although benzene hexachloride and parathion Bprays reduced 
the infestation of the Bhoot curculios, these reductions seemed to have 
little effect on final yields in L948, 
Ciirtu pesti 
The citrus red mite was controlled most effectively in Florida with 
wettable sulfur in combination with bis(p-chloropnenoxy) methane 
