o MONTHLY LETTER OF THE BUREAU OF ENTOMGLOGY ~~ 2 C, 
| UNITED STATES DEPARTMENT OF AGRICU TWREC © 193] « 


Sestis eteeereres aavew anemones cnomnoreroernemee nore er SRC Oe AO BOE Oe ORS cen Sp ese Stews wo: Mescuee er ne ee 
Se eo eee neem s seer pernemeemennnna manent ein nemenyenes ant neespuasvnceesiaseveneranes ommpeemrennaeenenen, ean = 
GU, 8. Deserimost of agroultare 


Number 209 Activities for August 
Not for Publication 
ll ———————————————eeeEEeE ll—————————————— a cnn an 


DECIDUOQUS-FRUIT INSECTS 
L. F. steiner, in charge of bait-trap investigations of the ori- 
ental fruit moth at Cornelia, Ga., submits some interesting paragraphs, 
which might well be quoted, giving results of moth trapping, both as to 
actual captures and as to reduction in both twig injury and infested 
fruit. His summary of the records of injury to fruit may be quoted as 
giving a general indication of results. He Says: "The number of orien-— 
tal fruit moth larvae per tree which attacked the fruit averaged approx-— 
imately 7.5 for the baited orchards and 24.6 per tree for those not 
baited. The latter is a worm population in fruit per tree of four times 
That of 1930." In relation to this apparent benefit he points out that 
"Three important factors are tending to balance the infestation in the 
two areas (trapped and untrapped) and are hence lessening the apparent 
efficiency of the bait traps. The growers Owning both baited and un— 
baited orchards are concentrating their clean-up work on the latter. 
All releases of Macrocentrus ancylivorus (not a native parasite) have 
been made in or near unbaited check orchards. Larvae collected from 
several orchards since June 1 have averaged as high as 37 per cent para- 
Sitized. Migration into the baited area from unbaited orchards is lower-- 
ing egg deposition outside and increasing it to a lessor extent inside." 
"Positive proof of extensive movement or migration among oriental 
fruit moths at the present time," Mr. Steiner says, "is to be had in 
the recovery of a second adult (a female containing 133 eggs) which 
traveled over one mile of unbaited territory to the edge of the experi- 
mental bait area. Also in the recovery of a marked edult in a record 
trap on the opposite side of the large baited area, the releese having 
been made at the east corner and the moth being caught at the south cor— 
her after traveling over five—eighths of a mile of solidly baited trees 
in less than two days. Only the record traps * * * were being examined. 
in the 37-acre experimental area several recoveries were made within two 
days on the outer edges of the block, some as much as 1,000 feet from 
the point of release." 
Reporting on investigations of foreign parasites of the oriental 
fruit moth, H. W. Allen, Moorestown, N. J., says: "During this period 
(July-August) more than 122,000 parasite-containing hosts and nearly 
2,000 parasites and parasite colonies were shipped (from France and 
Italy), each individual of which has been examined to exclude undesirable 
living insects. These shipments have included seven parasite species, two 
Of which are new." The shipments were made by G. J. Haeussler. 
