ity.. 
Conditicns indicating heavy populations of beet leafhopper in 
Uteh end Arizona breeding areag.--u. Wi. Davis, of the Salt Lake City 
laboratory , on a trip through the ,erennial breeding area in Utah 
and Arizona found host-plant conditions favorable for a heavy popu- 
lation of BE. tenellus in 1934. ‘Throughout the area alfilaria, an im— 
portant host of the beet leafhopper, was growing thickly over most of 
the area below the $,000-foot level. Counts showed approximately one 
leafhopper every ¢ 4 feet. All females coliected were full of mature 
eges. In tose 458 where alfilaria had not germinated, KE. tenellus 
were collected on Covillea, another important host. In the Nevada 
area no Plantago or alfilaria was found to have serminated. Eriogonum 
was germinated in a very limited area. In this area only one specimen, 
a female E. tenellus, was taken on Covillea 
Low temperatures handica»s treatments for control of red spider on 
or the control of the red spider 
strawberry.--On his experiments 
(Tetranaychus bimaculatus Harv.), W. A. Thomas of the Chadbourn, N. Ge, 
laboratory, revorts as follows: "On January 30 the temperature dropped 
from norital sprins weather levels to 8° F. with a maximum temperature 
during the cay of 26° F., followed by another drop on the morning of 
January 51 to 54° F., which apvarently is a low record for the section. 
Following this low temperature, strawberry leaves infested by the red 
Spider were collected in the fields and brought to the laboratory for 
examination, These examinations revealed that practically all adults 
and nymphs had been killed, but the eggs were anoarently not affected. 
These were hstching freely within 3 days. 
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"The red spider has been particularly abundant on strawberries 
during the past year. This condition has been greatly aggravated by 
the long-continued drought which lowered the vitality of the plants. 
Control treatments have not been successful to date, attributable ap- 
parently to the low temperatures of the late fall and winter and also 
the extreme difficulty of reaching the spiders on the under surface 
of the foliage, which at this season of the year lies prone on the 
surface of the soil." 
Results of arsenical-residue-tolerance tests nae winter cab- 
bage.--In experiments conducted at Charleston, S. Gey by Weide hewme 
jr., on the 1933-34 winter cabb age crop», the lepal eee Ane of 
Q.01 grain of arsenious oxide ver pound of produce was exceeded by 
cabbage that received application of 2 pounds of paris green per acre 
10 and 20 days before harvest. The paris green was diluted with 9 
parts of hydrated ii The tolerance was exceeded on cabbage that 
received application of 20 pounds of calcium arsenate per ,acre »lOg 2G, 
and 30 days before pes rvest. The neg Pus limit was rather closely 
tage on cabbage dusted 30 days before harvest with the paris 
een mixture and by that dusted 40 ars before harvest with calcium 
ars senate at the rate given above. Applications of these two arseni- 
cals made at 10-day intervals during the remainder of the growing 
Season did not result in an arsenic residue appreciably above that 
of unpoisoned cabbage 
