Eee 
general spreading of the bait had not yet begune In addition to the 
above-mentioned States, bait materials are being shipped to other sections 
having heavy grasshopper infestations, outside the main area. Bait has 
been allotted to Nevada, Arizona, Oregon, Kansas, Utah, Colorado, and 
Michigan,in addition to the States covered by the fall survey. Active 
distribution of the bait has-been under way' in the more southern sectionse 
Approximately 25 percent of the estimated total bait is now delivered to 
the local distributing pointse ) 
Large numbers of chinch bugs’ left winter quarters in Aprile--lie Te 
Emery, Wichita, Kans., reports that an examination of 14 samples, each 1 
maeoot Square, of Andropogon sod since April 11, revealed an average of only 
21 bugs per square foot, as compared with an average of 195 bugs per 
square foot in samples taken in the winter. + Oviposition began in wheat 
about April 20, Curtis Benton, of the Lafayette, Inde, laboratory, has 
been temporarily stationed at Aurora, Ille, where he is cooperating with 
Professor ie Pe Flint in studying the food preferences of. the chinch bug 
during thei present severe outbreak in that area. A series of observa- 
tion fields have been located for the pmpose of determining whether bar~ 
ley can be used as a trap crop to prevent injury to other types of small 
erainss 
¢ » 
a ne Ree en eR NN A NE OE ne AE a ERE IS St a ee 
Valley.-- L. P. Rockwood and Te Re Chamberlin, Forest Grove, Oreg., report 
that rains, intermittent throughout ‘April, have kept the fungous disease 
caused by Kmpusa aphidis active during most of the monthe This disease 
has reduced the aphids (Tllinoia pisi Kalte) to numbers that are now 
causing little or no injiry, both in vetch and pea fields, although some 
pea fields still contain many aphidse The fungus continues to be effec- 
tive during warm clear days following rains, provided abundant dew remains 
upon the plants for-some hours of the daye 
The remarkable effect of this fungus upon population is shown ina 
hO-acre field of vetch which was being plowed on April 5 and which has 
been apparently ruined, aphids at that time averaging several thousand 
per 100 strokes of the net. As plowing of this field was not completed, 
..we had an opportunity on April 27 to examine the remainder of the crope 
By this time the fungous disease had reduced the numbers of aphids to 
less than 100 per 100 strokes of the net and undamaged plants were numer- 
OUSe Provided the aphids do not again incresse to destructive numbers, 
a fair crop of vetch should be produced, Some of the plants badly 
damaged on April 5 had been killed, but others had partially recovered by 
putting out new terminal shoots or new shoots farther down on the stems» 
On April 16 Austrain field peas infested by Ie pisi were dusted with 
derris dust with a silica filler, rotenone content 0.5 and Oe7 percent, 
and by nicotine with a lime filler, 4 percent nicotine or 10 percent nico- 
tine sulphate equivalent. The maximum reduction of aphids in the best 
perts of these plots was not over 50 percent and nothing approaching 
practical control was obtained. 
