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reasons thé dusting method is often resorted to, but it is much more expensive on a 
large scale than the spraying method. In a general way it may be said that the 
spraying method is very much preferable, especially in dry or tolerably dry weather, 
while in very wet weather the dusting method gives most satisfaction. 
(3) Any of the improved force pumps which are now in the market, in connection 
with a good atomizing nozzle, and more especially the “‘ Riley” or “‘ cyclone nozzle” 
which is described on pp. 211-219 of the 4th Report. For the dusting method sey- 
eral excellent and simple hand dusters can now be obtained, or, if nothing else be 
at hand, a flour sieve, with a double layer of fine muslin covering the bottom, will 
answer the purpose. - 
(5) Neither Paris green nor London purple, being compounded substances, has 
achemical name. An analysis of London purple is given on page 149 of the report. 
Neither is soluble in water, though London purple has a larger proportion of 
soluble matter. . 
The chief requirements in successfully coping with either of the worms are: (1) 
watchfulness for the first appearance on the underside of the leaves and early spray- 
ing before the leaves become seriously eaten or ragged; (2) spraying as far as pos- 
sible on the underside of the leaves and as finely as possible, in order that the poison 
may adhere and not be washed off. 
The Strawberry Leaf-roller. 
Ths object of this note is to ask you what we should do with our berry patches 
that are troubled with leaf-roller. A bug or fly deposits an egg on the tender leaf; 
in time it is hatched out, and as the worm grows it rolls up the leaf, and thus 
absorbs the vitality of thestrawberry plant. * * * [havetwenty-twoacres of straw- 
berries that were somewhat troubled with it last year and I fear it more than all 
other insects that infest the strawberry. Would spraying kill it? As it is so com- 
pletely hid beneath the folds of the leaf I hardly think spraying would reach it. 
[B. F. Smith, Kansas, April 18, 1891. 
Repty. The insect which is damaging your strawberries is probably the common 
Strawberry Leaf-roller (Phoxopteris comptana, Frol.). It is originally a European 
species and was probably imported into this country in the sixties. In Illinois, as 
was discovered in 1867, there are two broods during the year. The worms of the 
first brood, which appear during the month of June, change to the pupa state within 
the rolled-up leaf and become small reddish brown moths during the month of July. 
The moths pair and the females lay their eggs upon the plants and the second brood 
of worms which hatch reach full growth about the end of September and pass the winter 
in the pupa state. Farther south there is a third brood, but the insectalways winters 
in the pupa state within the leaves. 
As with many other strawberry insects, the best remedy consists in burning 
over the field soon after the fruit is gathered, and you are doubtless aware that this 
does not injure the plants, which invariably send up new strong leaves and make a 
dense growth by fall. The repetition of this treatment for two more years will re- 
duce the insect to insignificant numbers. The best plan is to first mow the whole 
field over as close to the ground as it can be cut with a mower and then leave the 
cut leaves and foliage to dry for a few days. Then loosen and rake up the straw 
mulch, sometimes spreading it over the rows, and fire the field in a gentle breeze, 
If there is no mulch scatter straw lightly over the plants.—[April 22, 1891.] 
The BElectric-light Bug. 
Inclosed please find an insect which is known as the ‘ Electric-light Bug.” No 
one with whom I am acquainted ever saw the insect until the steamers which run Red 
River put on the electric light. They fly against the lights and are killed thereby, 
and fall upon the boat’s deck. * * * [John L. Kimball, Louisiana, March 8, 1891.] 
