CHAPTER X. 
REMEDIES: MEANS OF COPING WITH THE INSECT: SUB- 
STANCES USED FOE ITS DESTRUCTION. 
In this chapter we shall treat of remedies against the insect, but 
more particularly of methods arid principles and of substances that may 
be used for its destruction. Mechanical contrivances and machinery 
for the proper application of the remedies will be considered in subse- 
quent chapters; for while it is not always easy to discuss a remedy with- 
out including the means of its application, yet this classification of the 
matter of the report has been found most expedient. 
DESTRUCTION OF THE EGGS, CHRYSALIDES AND MOTHS. 
Destruction of the eogs. — The exact knowledge of the natural 
history of any injurious insect enables us to recognize its vulnerable 
points, and to indicate those stages in which it may be dealt with most 
effectively and most economically. The eggs being laid singly on the 
under side of the leaves, and being, moreover, hardly perceptible, from 
their small size and protective color, it is at once apparent that every 
attempt to mechanically destroy them in large numbers must be fruit- 
less. Topping the cotton, as a means of destroying the eggs, is, as we 
have already shown, of little avail at the most critical period. Experi- 
ence has shown that the vitality of the egg is not destroyed by the ap- 
plication of a moderate quantity of insecticides of any description. Mr. 
►S telle reports that u London purple has destroyed and prevented the 
hatching of the Aletia eggs" to which it was applied three days previ- 
ously, and numerous experiments proved that kerosene also, when 
brought in contact with the egg, will destroy it. However, in order to 
destroy the egg, both London purple and kerosene have to be applied in 
such quantities as to be injurious to the plant. 
Destruction of the chrysalides. — The chrysalis of Aletia, more 
or less perfectly protected by leaf and web, affords little chance for its 
successful destruction. The destruction by crushing or otherwise of 
any chrysalides observed early in the season ought not to be neglected, 
but later in the season, when they abound, they cannot thus be econom- 
ically destroyed. There are, however, periods when the extensive de- 
struction of the chrysalides would seem practicable. Whenever a field 
of cotton has been defoliated, the worms web up thickly in the sur- 
rounding weeds and brush, which may then be cut and burned. This 
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