- kk- 



VI. Insect Pests of Sugar Cane and Sugar Beets 



La, A Study of the Destructive and Beneficial Insects of 



Sugar Cane in Order to Develop Economical and Practical 

 Measures of Controlling the Harmful Species . To determine 

 or further refine and correlate control measures of the 

 important insects attacking sugar cane through studies of 

 biology of the pests and their natural enemies and 

 insecticidal, cultural, and biological control practices for 

 such insects as sugar cane borer, rootstock weevil, aphids, 

 wireworms, nematodes, springtails, sugar cane beetle, 

 parasites and predators. 

 Ent. 581 Coop. ARS 



Minn. Biology and Control of Injurious Insects on Sugar 



Beets in Minnesota . (1) Evaluate injury caused by injurious 

 insects on sugar beets. (2) Identify species involved and 

 make observations on their biologies. (3) Study ecological 

 conditions under which injury occurs, (k) Study control 

 methods in cooperation with American Crystal Sugar Co. 

 Ent., Econ» Zool. I736 



P. R. Control of the Sugar Cane Moth-Borer, Diachtraea 



Saccharali s (Fabriciusj in Puerto Rico . To determine 

 (1) usefulness and effectiveness of insecticides, in 

 control of sugar cane moth-borer; (2) proper time, intervals 

 and number of applications of insecticides for effective 

 borer control; and (3) minimum dosages per acre of 

 insecticides to be applied in fields for an economical and 

 effective borer control. 



Ent., Agron., Hort. 35 



P. R. Transmission of the Chlorotic-Streak Virus of Sugar Cane 



by Insects . (1) Find insect vector(s) of chlorotic- streak 

 virus of sugar cane. Study (2) relationship of virus to 

 vector; (3) host range of virus among sugar cane varieties 

 and related plant species (in greenhouse); (k) degree of 

 susceptibility of cane varieties to streak virus under field 

 conditions. (5) Devise methods to control disease. 

 PI. Path., Ent. 120 Coop. ARS 



