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Insect 
Shade- tree insects 
Stictoccphala festina Say 
Tetreiiychus te larius L. , 
common red spider 
Thrips t abaci Lind. 
Thyanta custator F. 
Zophodia grossolariag 
Riley, gooseberry 
fruitworn 
Cpnp arat ive Ac t ion 
Sprays; 
derris 3> cube 
Dusts: 
cube 
derris 
Sprays: 
derris = cube 
derris 
cube 
Dusts: 
derris ^> cube 
Sprays: 
derris > cube 
Dusts: 
derris = cube 
Ho fere nee 
Felt and Bronloy 
Cassidy and Barber 
Richardson 
Weigel and poison 
Cassidy and Barber 
Hammer 
do. . 
Roark concludes that the apparent superiority of derris over cube 
nay be due to its finer particle size and to a higher rotenone content than 
is shown by analysis. 
From information now available, any insecticidal superiority of derris 
over cube is more than offset by the present difference in price, which is 
11 or 12 cents per pound. One hundred end thirty-two pounds of powdered 
cube can be purchased for the price of 100 pounds of powdered derris of the 
same (5 percont) rotenone content. Moreover, the principal agricultural 
insect pests against which rotenono is used, such as the Mexican bean beetle, 
the pea aphid, and three species of cabbage worms, are as readily controlled 
by cube as by derris of equal rotenono content. At present prices more 
economical control of those insects susceptible to rotenone can bo secured 
with cube than with derris. 
The Now York Agricultural Experiment Station (306) in its 1937 
annual report (published in 1938) reported that insecticides tested under 
orchard conditions against the apple maggot ( Rhagoletis porno no 11a Walsh) 
in 1936 included phenothiazine, powdered cube root, and hydrated lime. 
Six small orchards were tree-ted, all the trees in each block receiving a 
single test material as is customary in such experiments. Little or no 
control was obtained where hydrated lime alone was used, but the results 
were sufficiently promising with cube root and phenothiazine to warrant 
additional testing. 
In tests conducted on the control of the gooseberry fruit worm 
( Zophodia, grossulariae Riloy) in heavily infested currant fields, excel- 
lent results wore obtained with powdered derris or cube root applied 
eithor as a dust or spray. Two pounds por 100 gallons of a derris or cube 
