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Aphids on chestnut trees 
Black plant lice on chestnut trees fell off In a few rainutes when 
sprayed with a commercial derris product [probably Meoton] . — Anonymous (l, 
in 1927. 
Aphids on chrysanthemum 
Compton (51) in' 1930 recommended Derrisol for the control of aphids 
on chrysanthemums. 
Aphids on chrysanthemum were controlled by a rotenone spray of 
1:5,000 plus 0,1 percent of Agral I.--Wageringen Plantenziektenkundigen 
Dienst (_293) in 1934. 
Aphids on citrus 
Symes ( 255 ) in 1924 reported that two proprietary derris extracts 
gave highly satisfactory results against che black citrus aphid in Rhodesia 
Winston ( 513 ) in 1926 reviewed information on Derrisol for the 
benefit of Florida citrus growers. Derrisol should be diluted 1:800 for 
use against aphids. Should a grower be spraying with lime and sulfur 
solution- for rust mites, oil emulsion for scale, bordeaux mixture for 
fungus diseases, or lead arsenate for chewing insects, and any aphids 
be present, an addition of Derrisol 1:800 will pay handsomely, enabling 
this pest to be controlled with the one spraying; or if aphids are present 
and no other application is to be made, Derrisol mixed with water without 
soap will be the cheapest efficient liquid aphicide that can be applied. 
Ehoads and Debusk (230) in 1931 recommended derris preparations at 
the rate of 1 pint to 100 gallons of water for spring applications for 
the control of aphids on citrus in Florida. These should be applied at 
the time of first flush of growth. By employing some of the more effi- 
cient spreaders (certain oxidized oil derivatives, oleates, or pine-oil 
soaps) the quantity of nicotine sulfate or derris compounds required 
for 100 gallons of spray mixture may be cut down to 1/4 pint at a 50rpercei 
saving in cost. For the spray to be applied late in winter, 1 table- 
spoonful of derris compound to 2 gallons of water is recommended. 
Basinger and Boyce (13) in 1956 reported that cryolite and barium 
fluosilicate may be combined with derris preparations for citrus aphid 
control. Organic compounds used alone were ineffective. 
The California Fruit Growers' Exchange, Bureau o£ Pest Control (35), 
in August 1936 reported that Ortho Derris and Tox-X with from l/2 to 2/3 
percent of light medium oil have given good results against aphids. 
The Leffingwell Company in 1937, in a letter to R. C. Roark, stated 
that Tox-X (2,5 percent rotenone plus a spreader) plus oil has given 
promising results against aphids on citrus in California. 
