^(i INSECTS OF ECONOMIC IMPORTANCE 



growers although they may destroy much setting 

 fruit; the larv?e make cocoons on the leaves and 

 some transform to moths that appear latter part of 

 July; these moths lay eggs on the grape berries and 

 these larvae go into the berries and cause the 

 wormy grapes ; the larv?e mature in Sept. and make 

 cocoons on the leaves ; these fall to the ground where 

 the pup?e pass the winter. 



Control — Spray w^ith the following mixture, 

 first just after the blossoms fall, second, about two 

 weeks later or when the grape berries are just 

 touching: arsenate of lead 3 pounds, resin fish-oil 

 soap I pound, added to Bordeaux 3-3-50.'^ 



The grape-blossom midge ^ (Confarinia johnsoni) 

 Order — Diptera 



This insect has been injurious in certain vine- 

 yards in Chautauqua County for several years; it 

 is most injurious to early varieties; the larvae live 

 inside of the blossom buds and injure them by feed- 

 ing upon the pistil; infested buds become much 

 swollen and blasted. 



Adults emerge from soil the latter part of May 

 and deposit their eggs w^ithin the buds by means 

 of a long telescopic ovipositor; the larvae attain 

 their growth a few days preceding blossoming and 

 then crawl out of the bud ; they drop to the ground 

 and burrow beneath the surface where they form 

 cocoons and remain until the following spring when 

 they change to pupae. 



Control — No efficient method of control known. 

 The grape leaf-folder ^ (Desmia funcralis) 



Order — Lepidoptera 

 In midsummer and later, many grape leaves may 



7 Iselev— U. S. Bu. Ent., Bull. 550. 



8 Hartzell— N. Y. State Expt. Stat, Bull. 331. 



9 Strauss— U. S. Bu. Ent, Bull. 419. 



