490 JOURN.VL OF ECONOMIC ENTOMOLOGY [Vol. 14 



by a west or northwest wooded area. Little difference is observed 

 whether the grape rows parallel the wooded or waste land strip, or are 

 peq^endicular to these conditions in the area aft'ected by the moth, 

 for the spread seem.s to be uniformly deep under each condition. By 

 reference tot he accompanying map (Fig. 10) a remarkable variation in per- 

 centages of infestation in portions ofthe various vineyards will be noted. 



During the summer of 1919 spraying and dusting experiments were 

 carried on in the vineyard which had a heavy infestation, and although 

 results were excellent, they were not reliable, for it has been proven 

 that the heavily infested area coincided with the check plot, the only 

 manner in which the relative m.erits of spray materials can be determined 

 against this pest is to be certain that the areas treated in both cases 

 are uniformly infested, which is not the case throughout this region, 

 except the one uncultivated field mentioned above. 



In conclusion it seems only reasonable to believe that the most effective 

 way to control the grape berry moth is by burning over and clearing 

 waste places and head lands. T.his was tried out by one grower during 

 the season of 1920, and showed excellent results where a spotted in- 

 festation had occurred the previous season. In cases where trees or 

 vegetation are left as protective wind breaks, the general spraying must 

 be continued, but it is shown that in m.any cases the study of the local 

 conditions will help the grower to com,bat this pest more easily. Great 

 emphasis should be placed, however, on cultural and clean farming 

 methods in attempts to control the grape berry m.oth. 



THE EFFECT OF TIME OF SOWING UPON THE CONTROL OF 

 THE WHEAT SHEATH WORM (HARMOLITA 

 VAGINICOLUM DOANE)' 

 By T. H. Parks, Ohio State University 



Observations commenced in 1918 and continued through four seasons, 

 have pointed to time of sowing as an effective control for this injurious 

 wheat insect in Ohio. The annual Wheat Insect Sur\^ey has given us 

 data pertaining to both Harmolita triiici and this species with respect to 

 date of sowing. Observations upon the de\^elopment of H. tritici 

 have not showai much relation between sowing dates and degree of in- 

 festation. In 1918, when observations were commenced with H. vagini- 

 colum, it was apparent that time of sowing had a great deal to do with 

 the degree of infestation. During that A^ear in Northeastern Ohio all 

 spring wheat and all late sowed winter wheat were badly infested with 

 this insect, and the yields greatly reduced. 



'Formerly genus Isosoma. Revised by Phillips and Emery, Proc. U.S. Nat. 

 Mus. 55, pp.440. 



