mak 
to date very few have emerged. A shower brought out a considerable number, 
but not as many as would have emerged if the rainfall had been normale  Mre 
Howard notes further that no complaints have been received during past month 
concerning insect damage. 
Drought reduces pea aphid infestations in Wisconsine-=Je Es Dudley, 
of the Madison, Wis., laboratory, reports that “the drought continued in the 
principal pea-growing sections of Wisconsin and record high temperatures oc= 
curred throughout the last 2 weeks in Maye These high temperatures, and es= 
pecially the high maximd, were detrimental to the aphids (Illinoia pisi Kalt.) 
and the infestation dropped off noticeably, so that by the latter part of May 
there was no serious infestation in any of the fields inspected around 
Madison end the reproduction of aphids was very small. The effect of con- 
tinued high temperatures on reproduction of the aphid has been carefully ob- 
served in the life-history studies in a field insectary for 2 years. Such 
high temperatures for a time accelerate the growth and reproduction of aphids 
but soon result ina greatly shortened longevity, lessened reproduction, and 
death or lack of reproduction in the following generations" 
Winged pea aphids appear in Wisconsine--J. E. Dudley, of the Madison, 
Wise, laboratory, reports as follows: "During the first part of May the sweep= 
ings in alfalfa showed a continued large number of alate pea aphids which with 
out question had flown in from firth r southe These winged aphids and their 
progeny constituted a very large proportion of the total infestation on alfalfa | 
for approximately the first half of Maye After that it was impossible to 
separate the progeny of winged migrants and the progeny of stem mothers." | 
| 
Mole cricket attacks reaching serious proportion in the South.-~We Ae 
Thomas of the Chadbourn, N.C., laboratory, reports: "The mole cricket (Scap- 
teriscus vicinus Latr.) population, which has been gradually building up dur- 
ing the past 4 years has reached the point where growers are having consider= 
able trouble in maintaining a stand of plants. This is especially true of 
tobacco. One grower reported that most of his crop was destroyed by this in= 
sect. On our recommendation, he applied poison bait to the affected area and 
e weeks later reported that he had seen no further injurye He was particular~ 
ly delighted with the poison bait, because it not only killed the mole crickets 
but also destroyed the cutworms at the same time. Other growers here are 
turning to the poison bait for relief against this peste" 
Sulphur effective as a fumigant for mushroom housese--A. C. Davis, of 
the Takoma Park, D.C.e, laboratory, reports as follows on his investigations on 
sulphur as e control for mushroom pests; "In the summer clean-out of mushroom 
houses, when the temperatures rise above 70° F., a mean concentration of 4.0 
mg per liter, maintained for 100 minutes, should give a 100 percent kill of 
all insect and mite pestse In the fumigation chanber at 100° F,, and about 
JO percent relative humidity, which as nearly as possible duplicates the cone 
ditions along the floor level of mushroom houses during the heat, mean concene 
trations of 7.04 and 7.86 me per liter for 130 and 80 minutes, respectively, 
gave 100 percent kill, It seems safe to say that a mean concentration of 8 
m e@ per liter for 100 minutes can be depended upon to give complete clean-up 
of insect and mite pests. At 1200 Fe, in the fumigation chamber, about 4050 
