UNIVERSITY OF FLORIDA 
-14- 
3 1262 08721 6569 
In shade-grown tobacco when joint infestations of flea beetles and 
grasshoppers appear on newly set plants, barium fluosilicate is recommended. 
This material should be applied at the rate of 3 to 5 pounds per acre for each 
application. The clay diluents used for dusts to be applied on tobacco some- 
times leave a whitish deposit on cigar-wrapper leaves grown under shade. This 
is undesirable, and sterilized tobacco dust has been found to be a satisfactory 
substitute for the clay diluents for use on the shade tobaccos. If tobacco 
dust is used, the manufacturer should certify that the dust has been sterilized 
and that it is free of pathogenic organisms which might spread tobacco diseases. 
CLEAN-UP MEASURES AS AN AID TO CONTROL 
Emphasis should be placed on the thorough cleaning up of crop remnants 
after harvest. It has been observed, in the southern producing areas partic- 
ularly, that fields of harvested cabbage and similar crops serve as a source 
of infestation to new plantings. 
WHERE TO OBTAIN INSECTICIDES 
Information regarding the purchase of the insecticide materials men- 
tioned in this circular may be obtained usually through local dealers in agri- 
cultural supplies, seedsmen, general stores, drug and department stores, or 
through the county agricultural agent, State agricultural experiment station, 
State department of agriculture, or Bureau of Entomology and Plant Quarantine, 
U. S. Department of Agriculture. 
