10 
in gardens. Considering the great susceptibility to damage from red 
spider of beans, cowpeas, and other leguminous crops, and orna- 
inental plants, it is advisable, where this mite is very destructive, as 
in the District of Columbia and southward, to practice rotation with 
plants not so subject to injury. The lye-sulphur remedy has pro- 
duced the best results, as just described. Some of the remedial meas- 
ures advised for the cotton red spider (Vetranychus gloveri Bks.), 
a related species occurring in the Gulf region, may be followed; in- 
deed, the same measures are applicable to aphides and other pests 
which may be present on the plants at the same time. 
Among cultural methods of control may be mentioned clean garden- 
ing or farming with early fall plowing, keeping down the weeds of the 
vicinity throughout the year, and destroying crop remnants as early 
as possible by burning or otherwise. Weeds growing on the edges of 
fields, in fence corners, and like locations should be destroyed early in 
the fall in order that no winter shelter may be left for the pests. 
<arly fall plowing destroys the insects before they have an opportu- 
nity to leave the old crop plants for weeds and others. 
During May, 1908, Mr. H. M. Russell, working under the writer’s 
direction at Orlando, Fla., conducted some experiments with reme- 
dies against the red spider in its occurrence on wax beans. The 
results obtained, in brief, are as follows: 
IKkerosene-soap emulsion, 1 part stock solution to 10. parts 
WAST ae cal Te le eee eae a ee oe aie ee eae ae 95 per cent. 
Lye-sulphur, 1 pound sulphur, 3 pound lye, to 40 gallons water, 
Nill @ @ Sees ae ee gee eS ee oe ae ee ee Se ee 9S per cent. 
Sulphur water,.1 ounce to 1 gallon water, killed______________ 91 per cent. 
Lime-sulphur, 1 pound lime, 1 pound sulphur, to 25 gallons 
Water Scilled 22" 28 < 2 ON eee oe LN ale te ee 6S to SS per cent. 
The results show that the red spider succumbs to any one of these 
four insecticides, the probabilities being that kerosene-soap emul- 
sion, properly prepared and applied, is as satisfactory a remedy as 
any other appheations that could be employed. 
SUMMARY. 
The remedies advised may be summarized as follows: 
For the greenhouse and for general use, sulphur and neutral, whale- 
oil, and other soap solutions, kerosene-soap emulsion, and spraying 
with water. 
For the treatment of trees and shrubs, the same as the above, with 
the addition of resin wash and the lime-sulphur and_ lye-sulphur 
mixtures. 
For truck and garden plants, lye-sulphur wash and the same 
remedies as for the greenhouse, with the addition of clean gardening 
[Cir. 104] 
