39 
method of warfare against the adults will prove more efficient than any 
other alternative yet resorted to against them. It is evident, however, 
that to be most efficient, the poisoned sweets must be applied from the 
time when the moths begin feeding freely, and in such a way that they 
may meet with them readily in their flights about their food plants. 
The first will be accomplished if applied as early as 4 o'clock in the 
afternoon, in which case the poisoned liquids would also be exposed to 
their visits during the evening and night. The second can be attained 
by spraying the poisoned liquid upon the food plants. For those moths 
feeding during the day this must be applied principally to cow peas, for 
those feeding at night upon cotton. 
The practicability of this method is yet somewhat questionable since 
probably one application of the poisoned liquids would be efficient only 
for a few days. It may further be questioned in that, as has been noted, 
the moths of any given brood issue quite scatteringly. At the same 
time it may be that applications of the poisoned sweets at intervals of 3 
or 4 days will prove to be as practical as arranging for, and attending to, 
light trapping properly. My own efforts to experiment fully along this 
line were rather frustrated by rainy weather during September. This 
made experiments difficult and more or less indecisive. 
The possible utility of combining poisoned sweets with lights has al- 
ready been noted. The fact that females are readily attracted by sweets 
before many eggs have been deposited by her may become a sufficient 
additional inducement to entice those flying so near the lamps to linger 
a few moments longer and probably result in her capture. With these 
probabilities in mind it is to be hoped that the approaching season may 
be more propitious for experimental work and the Boll Worm more 
abundant. 
PYRETHRUM. 
Experiments with the dry powder. — The lirst of the following series of 
experiments with pyrethrum were made upon infested corn. The patch 
of corn was about two rods square and located near the center of the town 
(Holly Springs, Mississippi). It was a second planting and was only 
knee high at this time, August 19. The middle rows of the patch were 
selected and one row for each experiment taken. The powder was 
dusted from above down into the bud of the corn by means of a small 
cheese-cloth sack, double thickness. 
Experiment 1. 
August 19, 2:30 p. in. Mixture, equal parts lime dust and pyrethrum. The plants 
iu the row by actual count contained 43 worms of various sizes. 
Result. — Soon after dusting a few acted uneasily, began to crawl, and finally drop- 
ping to the ground, hid in the loose earth. This note applies more or less to all the 
experiments made with the powders. August 20, 10 a. m., 17 worms alive and feed- 
ing, 10 dead, 16 not present. In percentages this is 39.5, 23.3, 37.2, respectively. The 
living worms were mostly nearly mature ones which had penetrated far into the 
center of the bud and may not all have come in contact with the powder. The dead 
