CONTROL OF INSECTS INJURIOUS TO THE GRAPE 



F. Z. HARTZELL 



Associate Entomologist, Vineyard Laboratory of the Xew York Agricultural 

 Experiment Station, Fredonia, X. Y. 



GENERAL DIRECTIONS FOR THE TREATMENT OF VINEYARDS TO 

 PREVENT INSECT DEPREDATIONS 



,s^^^^ We note the stress laid by the medical 



world upon prophylactic measures, thus 

 p keeping men healthy rather than allowing 



them to become ill and then applying 

 remedial treatment. The same logic applies 

 to vineyard practice so far as parasites are 

 concerned. In other words, it is usually 

 comparatively easy to prevent serious trou- 

 ble from insects, while if an injurious 

 species becomes established it not only may 

 cause considerable financial loss, but the owner may have a diffi- 

 cult problem in eradicating the pest. Special treatments for the 

 control of the more injurious species are given below ; but, before 

 discussing these, directions will be given to assist growers to avoid 

 such trouble. 



Clean Culture 



Conditions in and around vineyards often determine the sus- 

 ceptibility to or immunity from insect pests. Grape growers 

 should not allow weeds or grass which die and lodge to remain 

 above ground in the vineyard during the winter. Such growth 

 can be prevented by planting cover crops which remain green 

 during the winter. On level soil, plowing during the fall after 

 the grape foliage has fallen will be found very beneficial if weeds 

 and grass are present. If grape-berry moth is present, fall plow- 

 ing, by which all fallen leaves are covered, will assist in the con- 

 trol of this pest, as well as other species which hibernate in rub- 

 bish. Vineyards infested with the rose chafer will be benefited 

 by the planting of surrounding areas, in which this insect passes 

 the larval stage, to cultivated crops. All fence rows and waste 



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