168 INJURIOUS INSECTS OF 1909 AND IQIO. 
pear on the leaves. These later become dry, and the dried portions 
may fall out, leaving the leaves with the appearance of having been 
riddled with shot, whence the common name. The chief damage 
done is in the enormous decrease of leaf surface and the defoliation 
of the tree. It has been found that 2-4-50 bordeaux or 8-8-50 self 
boiled lime sulfur will effectively control the disease if spraying 1s 
begun early and continued throughout the season at intervals of 
about two weeks. 
COMBINED TREATMENT FOR INSECTS AND FuNGusS PESTs: 
Lime sulfur wash in the dormant season. Arsenate of iead and lime 
sulfur (self boiled) as the buds begin to swell. Repeat at intervals 
of two weeks until fruit is ready to harvest. 
Potato. 
CoLoraApo BEETLE: This striped pest hibernates in soil. As 
the potatoes show above ground the beetles are on hand to lay the 
yellow patches of eggs on the underside oi the leaves. The greasy 
looking grubs are the ones that do the damage. An arsenical in- 
secticide will kill them easily, especially if the spray is applied while 
the larvae are still small. 
Earty Buicut: The disease is confined to the leaf. upon which 
grayish, dry spots are produced. Usually the spots are charac- 
terized by the presence of concentric circles. Although the tubers 
are not affected, the effect on the leaves may be so serious as to very 
greatly diminish the leaf surface, thus making it imposstble to form 
normal tubers. In dry seasons considerable loss may result if the 
vines are not properly sprayed. Control consists of proper spraying 
with bordeaux ; when the plants are young, a 4-4-50 mixture should 
be used, but, after the first two sprayings, a 6-6-50 mixture may be 
used. The idea is to keep the vines covered with bordeaux from the 
time they are about six inches high until the end of the season. It 
is uncertain, at the present time, whether or not in Minnesota it 
would pay to spray to control this disease alone. 
Late Biicut: Late blight has, fortunately, not yet become 
serious in this state, except when the weather in August 1s excep- 
tionally wet. The leaves and tubers are both attacked ; on the leaves 
the disease appears first on the edges, blackening and drying them, 
while on the tubers dark, sunken spots are first developed, followed 
later by a dry rot or a soft, foul smelling rot which may continue 
