-133- 
Five tests of spray materials containing rotenone gave a control 
of 88*5 peroent, while pyrethruiD spray containing an excellent spread- 
ing agent gave a 97 percent control.— Bourne and Whitcomb (76). 
If an infestation develops during the summer, fair control may be 
obtained by thorough spraying with 0.5-percent summer oil plus 2.5 
pounds of derris powder (5 percent of rotenone) per 100 gallons, or 
other rotenone compounds at the directions of the manufacturers*— 
Outright (133). 
Attempts to oontrol the European red mite on apple with sprays 
at the pink bud stage failed* The most effective were summer oil e- 
mulsions, and a spray of 4 pounds of derris powder (5 percent of rote- 
noiB ) per 100 gallons of water with a spreader* Rotenone did not 
affeot the eggs, so two applications of derris 10 days apart were re- 
quired for control equivalent to that given by one application of 
summer oil* Rotenone was inferior to the ground root*— Dean (136 ) • 
Field tests were conducted with Syntone, a whitish emulsion con- 
taining 2*8 percent of rotenone, an oil, and a spreader. No deterior- 
ation occurred in the commercial concentrate* A spray containing 1*5 
pints of Syntone, 1*5 pints of Q oil, and water to make 100 gallons 
killed 99 percent of these mites*— Garman and Townsend (225 , 226) * 
In England a block of apples was sprayed with lime sulfur at 
petal-fall* Adjoining trees were similarly sprayed with lime sulfur, 
and then given an application of derris in white oil* Observations 
showed a severe attack on the first block but only a few mites on the 
second*-* °Hey (286) * 
The best treatment against the European red mite on apple and 
plum in Ohio is to apply a dormant oil if the overwintering eggs are 
numerous, and a rotenone spray (Botano R) in summer if the oil has 
been omitted and if the mites increase to dangerous numbers by mid- 
summer*— Houser and Outright (291) * 
In its aotive stages this mite in England is readily killed by 
lime sulfur, rotenone materials, and petroleum-oil oontaot sprays* 
The summer eggs and molting nymphs are not killed by lime sulfur and 
rotenone materials*— K earns and Martin (339 ) ♦ 
Some promise was shown by rotenone against the European red mite. 
— Parrott (457) . 
When cube powder was combined with 1 pint of mannitan monolaurate, 
fair control was obtained*— St einer (565) • 
