14 Kcatuclvy Circular N0. 31 ,
other than those upon which they chiefly subsist without at any pp
‘ p time endangering crops.  
TREATMENT i
The insect has proved a difficult one to combat because its It
larva feeds on the under sides of the leaves where insecticides i
V cannot readily be applied, and partly because the beans a1·e
rather tender plants and very strong solutions and mixtures of
i poisons are likely to burn the foliage. At one time in the states
. south of Kentucky, where the beetle was first established, dusting
i the plants with a mixture consisting of one part by weight of `
arsenate of lime to eight parts of ordinary builders’ hydrated
lime was recommended. The mixture was not entirely satisfac-
i t tory, and of late we have been suggesting a mixture consisting of
1 part of arsenate of lime, 1 part finely ground dusting sulfur
and 4 parts of hydrated lime, first suggested by Dr. WV. E. Hinds,
Entomologist of the Alabama Station. The ingredients should
be thoroly mixed, and the applications ought, for best results, to
I be made with a good duster. For small garden plantings about
cities, a piston cluster costing about $1.50 may be used. The
, l large plantings of truck growers and farmers require one of the
dusters slung by straps to the shoulders of the operator. Sev-
eral different types of these latter dusters have been produced,
mainly to meet the demand of cotton growers in the south. The
cost of those the writer has seen ranged from $5.00 to $20.00.
l _ the latter price being higher thran most bean growers in Ken-
l tucky are willing to pay. The dustcrs serve, however, for the
{ treatment of other crops, such as tobacco.
` Applications ought to begin as soon as the insects are ob-
served at work on the beans and should be made weekly in -1
· order to get the new growth.
Spraying with arsenatc of lead (llj ,.»i’ pounds in 50 gallons of in
water) can be praetist as it is for the tobacco worm. Carefully
_ done, this treatment seems to the writer a better one than dusting.
s \Vith suitable nozzles and by throwing the spray with some
A T force the under sides of the leaves may be completely covered
l