6 
ANNUAL BEPOKT> (»F DKPAHT.M KNT DK A(iitl( TLTl'ItK, 1940 
dence of a lowering of ripe-fruit infe>t;ition the -ame season. 
Studio and experiments an- under way to develop mole economical 
means for the mas> rearing of Macroci ",'/ u€ ancyltVOI US. 
In the recovery work there was no exceptional change in the 
status of total paras it i /.at ion of i he oriental fruit moth. M <i<-r<>< , ntms 
ancyU/vorvA continues to he the dominant species over a Large part of 
the area surveyed. Inareolata molestok (Uchida) -till persists in a 
QUmberof localities in the Midwest, where it was last released in L9S7, 
hut the species seems to he gradually fading out there, as in other 
sect ions. 
The ethylene dichloride emulsion developed by the Port Valley, (hi., 
laboratory has already come into wide practical use against the peach 
borer. One grower reports using 6,000 gallons of the emulsion pre- 
pared on his place, from which he obtained 100-percent control with 
sayings of percent for materials and so percent for labor as com- 
pared with the former paradichlorobenzene treatment, Injury to 
peach trees in northern Louisiana was found on investigation to have 
been caused in part by the use of an imperfectly emulsified mixture, 
and in part by a sndden drop in temperature that occurred late the 
preceding fall. 
In laboratory experiments at Foil Valley dichloroethyl ether con- 
tinned effective against larvae of the plum curculio in the soil. A 
considerable reduction in the quantity of water used was found possi- 
ble without loss of effectiveness. Conditions have not yet permitted 
satisfactory testing of this material under practical orchard 
conditions. 
The mobile laboratory unit engaged in the peach mosaic work trav- 
eled over 19,000 miles during V.KY.). the work resulting in approxi- 
mately 5,000 accessions. Many of the insects pointed to by the surveys 
as possibly responsible for spread of peach mosaic have already been 
used in transmission experiments at San Bernardino. Calif., and ar 
Brown 'wood, Tex. At these 2 points a total of 1,933 tests, involving 
more than 100 species of insects or mites, have been carried on since 
the work was begun in VX\x. 
A start has been made in tests to determine the ability of various 
suspects to transmit the phony peach disease. What appears to be a 
very satisfactory method for handling the leaf and twig feeders ha- 
been developed, and. at the close of \ { XV.K 1 14 tests were made involving 
over 785 individuals of some 40 species. The matter of handling the 
subterranean forms has presented a more difficult problem. Peach 
trees may he grown very easily in liquid media, thus permitting con- 
siderable manipulation of the root-, hut entirely satisfactory types 
of cage- have not yet heen developed. Direct observations are diffi- 
cult, Since the insects react unfavorably to light. However, a number 
oi root-transmission tests are under way. 
GRAPE INSECTS 
A study by the Sandusky, Ohio, Laboratory of the practical use of 
cultivation for controlling the grape berry moth in the vineyard indi- 
cates that about 86 percent of the cocoons .ire found in a soil strip L8 
inches wide directly under the vines, This emphasizes the importance 
of giving Special attention to the area under ihe trellises, which i^ 
the most difficult to reach. Only libout 18 percent of the moth- are 
