ot era es 
The cotton leaf worm made its appearance early in the season in sou . 
thern Texas, as is usually the case when it becomes abundant in other parts 
ef the Cotton Belt in the late summer and fall, In July. and August as it 
spread throughout parts of Texas many fields defoliated where arsenical 
psisons were not used, Not until September did it defoliate cotton fields 
in Oklahoma, Arkansas, Louisians, and Mississippi. The leaf worm infes. 
tation in Texas is one of the heaviest ever recorded, Many fields as far 
west as the Zig 32nd section were defoliated and. the worms were reperted 
astappearing in Arizona cotton fields, Outside of the Cotton Belt the 
adult leaf worm moths were reported as injuring strawberries in Wisconsin . 
on September 29 and as feeding on apple pulp and bruised apples in south 
western Missduri on October 2, At Port Lavaca, Tex., from 1,400 leaf 
werm eggs collected during September and early October 35 leaf worms hatched 
and 147 parasites emerged, From 1,000 leaf worm larvae collected during . 
Augast and en September 1, 599 moths and ll parasites were obtained, whil’e 
from 500 larvae collected after September 14, 305 moths and 22 parasites 
were reared, Thore was also an increase in the number of parasites reared 
from leaf worm pupae collected in September as compared to those collected 
in August. j 
Effect of wind on pink bollworm.-«It has been noted over a 13-year 
period that the total wind moveme:it at Tlahualile, Dgo., Mex., (Laguna - 
District) during September seems to be correlated with the pink b ollwarm 
infestation in the El Paso Valley and other parts of the western cotton 
areas. It is pretty well established that the pink bollworm moths can be 
carried by the wind for long distances and then start oviposition, While | 
deffnite proof of wind’ carriage is lacking, the heavier infestation in. 
western.cotton areas in years of greatest September wind movement in the _. 
Laguna, the infestations in ‘isolated, trap plantings, and the collection 
of pink bollworm moths in: the upper air, all point to this core lusion, 
This September ‘the total wind movement at Tlahualilo was greater than in 
1928,°1929, or 1932, but smaller than in 1930 or 1931. F.A. Fenton's pree 
diction, baséd on the wind movement, that the pink bollworm infestation 
in western Texas would be higher than in 1928, 1929, or 1932, has preved., . 
correct. 
“Insecticides tested on pink. bollworm.-—-During. the past season a large 
serics of insecticides have been tested by, F, A. Fenton, A. J. Chapman, — 
and assistants, El' Pase,. Tex. in‘ small field plots and in the 1 aboratory. 
for ‘pink bollworm: control. Calcium arsenate, copper arsenite, Copper car~ 
bonate, barium fluosilicate, bordeaux mixture, and sulphur gave.no larval 
control, Sodium fluosilicate, sodiun fluoaluminate, derris, and rotenom 
all gave some degree of control? Derris was by far the most effective of 
all the insecticides used, In addition to preventing the young larvae from 
entering the bolls, derris was also a repellent and decreased oviposition 
on the dusted bolls, 
