BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 59 
demonstrated thai the eggs are deposited principally on the upper and 
lower surfaces of the tomato leaves around the periphery of the plant. 
A poisoned bait prepared by mixing thoroughly 1 pound of cryo- 
lite and 10 pounds of bran with 1 quart of corn oil was nearly as 
effective as the cryolite-dust mixture. The bail was applied by hand 
and an attempt made to scatter the materia] lightly and evenly 
the leaves of the entire plant. Three applications were made at the 
same time and same time intervals as were employed with the dust 
mixture.-. Approximately 40 pound- of the bait was used per acre 
for each of the first two applications and from 60 to To pounds for 
the third application. 
Although several baits containing different poisons, mixed with 
corn meal, or with bran and corn oil. were tried in one field with 
rather poor results, research on these baits will be continued, since the 
cost of these material- per acre i> approximately the same as for 
rhe dust mixtures, and growers appreciate the ease and speed of appli- 
cation without the use of special equipment. The indifferent control 
obtained with these baits may be attributable to an uneven rate of 
crop development in the field where they were tested, since the resuit> 
were contrary to those recorded in the corresponding period of 1937. 
It has been found, however, that since corn meal, bran, and sawdust 
vary greatly in weight per unit of volume, it will be necessary to vary 
the composition of poisoned baits containing each of these materials 
to compensate for their variation in density. In general the sawdust 
baits are much lighter per unit of volume than those containing com 
meal or bran. 
Sprays containing cryolite diluted at the rate of 8 pounds to 100 
gallons of water plus a sticking or wetting agent gave a fairly effec- 
tive degree of control of the fruitworm. Although the results ob- 
tained with a dust mixture containing 40 percent of phenothiazine 
were rather unsatisfactory, the indications were that this material 
has possibilities as an insecticide for combating the tomato fruitworm 
if a suitable sticker can be found to make it adhere to the plants. 
Cuprous cyanide gave comparatively poor results against the tomato 
fruitworm. and copper cyanamide gave only fair control. 
Laboratory tests in southern California showed that hydrated lime 
was safer than talc for use as a diluent for paris green on tomato 
foliage. It was shown also that mixtures of cryolite and calcium 
arsenate with talc (50-30-20) might cause some degree of burning 
to the tomato plant, but additional tests are necessary to obtain final 
information on this point. The latter combination, if it could be 
used safety by the growers, would have a distinct field of usefulness 
as a threefold insecticide for the control of the tomato fruitworm. 
the tomato pin worm, and the species of hornworms (Protopm 
(Johan.) and P. qvinqaemaaulata (Haw.)) ordinarily found on to- 
matoes. These tests showed further that a poisoned-bait mixture 
consisting of 25 pounds of corn meal and 1 pound of a calcium salt of 
dinitrocyclohexylphenol was apparently not safe to use on tomato 
foliage, whereas a poisoned-bait mixture consisting of 25 pounds of 
corn meal and 1 pound of paris green injured the tomato foliage, but 
was rendered safe for this purpose by the addition of 1 pound of 
hvdrated lime to the formula. 
