BUREAU OF ENTOMOLOGY. 401 



counties). The insect has been reported in Meade County, Ky.. on 

 the Ohio River opposite Indiana. Throughout the area known to be 

 infested in 1922, the injury has been more or less spotted in in- 

 tensity. Heavy injury has been reported from growers in areas 

 known to be suffering relatively little as a whole. Numerous re- 

 <(uests for assistance have been received from central Kentucky, Vir- 

 ginia, and North Carolina, showing that the insect is attracting great- 

 est attention along the northern edge of the infested territory. Tests 

 with arsenicals and other insecticides are being conducted at the main 

 laboratory in Alabama and at a substation in Tennessee. The com- 

 binations which gave the most promise during 1922 are as follows: 

 As a wet spray, 1 pound of magnesium arsenate to 50 gallons of 

 water; as dusts (1) 1 pound of magnesium arsenate to 4 or 5 pounds 

 of air-slaked lime, (2) 1 pound of tricalcium arsenate to 9 pounds 

 of hydrated lime, (3) 1 pound of calcium arsenate, 1 pound of 

 dusting sulphur, 4 parts of hydrated lime. The calcium-arsenate- 

 sulphur-lime dust which was developed by the Alabama Experiment 

 Station has given good results in tests performed by the Bureau of 

 Entomology. During the late summer of 1922 several shipments of 

 Paradexodes epilachnae Aldr., a tachinid fly parasite of the bean 

 beetle, were received from Mexico. About 300 individuals were bred 

 from native larva? of the bean beetle, but most of these issued and 

 died in the late fall after the bean beetle had stopped breeding. An 

 agent of the bureau is now in Guatemala and Mexico searching for 

 additional parasites of the bean beetle. It is planned to make ad- 

 ditional shipments of this parasite in an endeavor to bring about its 

 establishment in the southeastern United States. 



Other insects injurious to peas and beans. — "Work on the pea 

 aphis has been continued on cannery peas in both Wisconsin and 

 California. Experiments with nicotine dust, using both the ready- 

 prepared dust and a machine which mixes and applies the dust at 

 one operation, have given some promise. Tests are also being made 

 of calcium cyanid as an open-air fumigant, but have not been com- 

 pleted. Studies on the migration of the aphis and the farm practices 

 in more heavily injured districts are being conducted in cooperation 

 with various State entomologists. Investigations on the control of 

 the bean fly or seed-corn maggot are being continued in New Jersey. 

 Further tests for the control of the bean leaf -beetle and bean aphis 

 are being made. Experiments for the control of the corn earworm, 

 which has attracted unusual attention as a pest of camiery beans, are 

 being conducted in Maryland. 



Sweet potato WEE\qL eradication and control. — The sweet potato 

 weevil eradication campaign has been continued successfully in Mis- 

 sissippi, Alabama, Georgia, and portions of Florida. During the 

 early summer inspection no infestations were found in the formerly 

 infested region of Charlton County, Ga., and Baker County, Fla., 

 but several farms with unsatisfactory histories are being closely 

 -svatched. Thorough inspection in territory surrounding the old in- 

 iested area has not revealed a single new infestation. The reduction 

 in the number of dangerous farms permits a closer supervision of 

 this territory, and the inspectors have been able to keep close check 

 of infested and suspicious stocks. In the infested area near Lily, 

 Fla., the eradication project has been continued successfully without 

 supplying the growers with clean planting stock. All seed materials 



