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to unfavorable weather.— Gabler ( 209) . 
Pristiphora erichsonli (Htg.), a larch sawfly 
A dust containing 0.075 percent of rotenone acted slowly but 
killed a number of the larvae.— McDani el (377 ) . 
Profenusa canadensis (Marl.) ( P. oollaris McG.), a sawfly-cherry 
leaf miner 
A spray containing 1 pint of aliphatic thiocyan*te (24 percent) 
in an oil base, 4 quarts of summer oil, 2 ounces of blood albumin, 
and 4 pounds of cube root (5 percent of rotenone) per 100 gallons, 
applied on May 16, gave 84 percent kill of the young larvae in their 
mines. Sprays containing pyrethrum extract, alone or with rotenon 
were ineffective, and nicotine sulfate and oil, or aliphatic thio- 
cyanate and oil with cube gave very poor results.— Hamilton (255) . 
(Pteronidea) Nematus ribesii (Soop.), the imported currantworm 
Sprays of derris gave better results than those of lead arsenate 
in laboratory and field tests in Holland.— H out en (292) . 
One of the more important uses of rotenone is to control the 
currantworm.— Howard and coworkers (294 , p. 31). 
Rotenone is effective; nicotine is ineffective.— Molndoo (383) • 
Diprionidae 
Diprion pini (L»), a pine wasp, or pine sawfly 
In control work on this insect in Holland, a dust consisting of 
an inert carrier, derris, and pyrethrum was used against the larvae.— 
Fran s en (197 ). 
Diprion simile (Htg.), the introduced pine sawfly 
Neodiprion lecontei (Fitch), the red-headed pine sawfly 
Neodiprion pinetum (Nort.), the white-pine sawfly 
Lead arsenate and cryolite were the best controls. A dust con- 
taining 0.75 percent of rotenone acted slowly, but killed a number of 
the larvae and would probably be useful where infestation occurs on 
conifers near vegetables.— Mo Daniel (377) . 
