a 
‘ Insect and Fungous Enemies of the Grape. 35 
CONTROL OF HORNWORMS. 
Vineyards sprayed with arsenicals for other grape insects will be 
little troubled as a rule by hornworms. Injury is likely to be evident 
in small unsprayed vineyards or on vines growing around the home. 
Thorough spraying of the plants with arsenicals should at once check 
the ravages of these insects. In the case of serious outbreaks in com- 
mercial vineyards, prompt measures are essential to obviate injury 
to the crop through the de- 
struction of the leaves. <A 
formula found. effective in 
the outbreak in Tulare 
County, Calif., during 
1919, is powdered arsenate 
of lead, 12 pounds; nico- 
tine sulphate containing 40 
per cent nicotine, 14 pints; 
water to make 200 gallons. 
COE aie 
~ 
mn 
Se 
as 
INSECTS AFFECTING 
THE CANES. 
THE GRAPE SCALE.” 
ee 
eked 
7 
ae 
4 
ae 
The grape scale has fre- 
quently been reported on 
grapevines, though it has 
not usually been so abun- 
dant as to cause serious in- 
jury. From the vicinity of 
the District of Columbia, 
however, frequent reports 
have been received during 
recent years, with speci- 
mens indicating its de- 
structive work, particu- 
larly in small home vine- 
yards, and to a small ex- 
tent in commercial plant- 
ings. The grape scale at- 
tacks the wild grape, Vir- 
ginia creeper, hickory, sycamore, and perhaps other trees. The insect 
is widely distributed in the eastern United States, ranging from 
Florida to New Jersey, westward to Missouri and Kansas, and has 
recently been found in California. It has also been reported from 
Brazil and the West Indies. 
ed 
mee 
Fic. 86,—The grape scale on grape canes. Enlarged. 
20 Aspidiotus uvae Comst. 
