- 4ft - 
Ueigol and Nelson (458) in September, 1936, reported that in green- 
house tests at Boltsviile, Md. , sprays containing 0.0056 percent rotcnone and 
pyrothrun extract (1:10,000) with suljphonatod castor oil added (I: 300) as 
a spreader, and organic thiocyanabe sprays diluted 1:300 were effective in 
killing adults and nynphs of lhrips tabaei Lind. , without injurs to the treated 
cucumber plants in the greenhouse. These sprays wore applied at 300 pounds 
pressure "by a specially devised greenhouse power sprayer. The addition of 
pyrethrun extract to cither the dcrris or cube powder sprays was found to 
enhance their efficiency against the thrips. .An immediate effect was evi- 
dent against both the adults and the nynphs. The cube powder, plus the sul- 
phonatcc 1 caster oil, was not so effective as a e'erris powder spra3", even 
though the rotononc content (0.0056 percent) of both was the sane, Inciden- 
tal!: , it was observed that no mildew appeared in .any of the sprayed plots, 
whereas in the check plots it was consistently present. This nay indicate 
sonc fungicidal action on the part of the sprays containing rotcnone or or- 
ganic thiocyanatcs under the conditions of the cxperinont. 
White (463) in 1936 in the publication E-376 of the Bureau of En- 
tomology and Plant Quarantine, issue:! recommendations for the control of in- 
sects attacking certain /ego tables, snail fruits one 1 tobacco. Dcrris is 
reconnendod for the control of several insects and 'eg implication cube nay 
be used in place of derris. Cube is specifically mentioned as follows: 
"Preliminary experiments in California have shown that dcrris, 
or cube, or pyrethrun dust mixtures, at the same dilutions as have 
been mentioned for cabbage, gave as satisfactory results in the con- 
trol of the three rorc common species of cabbage worms on cauliflower 
as they did en cabbage." 
Cube is given as the equivalent of derris for the control of the Mex- 
ican bean beetle and the tobacco flea bcotl< , 
TCisecup (473) in 1936 reported laboratory tests diroctoc! against 
quarter- ;r own lo.rvae of the imported cabbage worm, F ieri s raiae L. , at San- 
ford, Fla. A cube dust mixture containing 0.055 percent rotcnone was very 
effective in killing the larvae of this species, one! this dilution is the 
most suitable of any of the dilutions tostcd for use in obtaining comparative 
results of the reactions of insecticides to P. rapao larvae. 
Wisecup (474) in 1936 also reported laboratory tests made at Sanford, 
Fla., with half-grown larvae of the southern arnywom s Prodeuia eridani a 
Cram, In general, these laboratory tests indicated that poisoned— bait mix- 
tures consisting of bran, cottonseed need , cr corn meal, paris green, cryolite, 
phono thiazinc, or cube, with syrup and ground lemons, were not sufficient to 
overcome the attractiveness of the natural green food of the southern army- 
worn larvae. Paris green and synthetic cryolite were much superior to cube 
Pelt and Bromley (144) in 1937 reported that cube powder appeared 
slightly less toxic than derris powder when applied as sprays at the rate of 
3 lbs. of powd.er (rotenone = 4 percent) to 100 gallons of spray. Cube 
powder was also applied in a mixture of summer oil 1:200 as a contact insec- 
ticide against shade tree insects in Connecticut. In general, results on ex- 
