The Gall-Gnats 



There are two generations annually in New York, and three 

 in the District of Columbia. 



The species also breeds in white clover, and is frequently so 

 numerous as to destroy the clover-seed crop over a large section 

 of the country. 



The remedy is a simple one, and affords an excellent example 

 of the value of accurate knowledge of the life history of injurious 

 insects. It is the custom in the northern states to cut clover 

 twice in the season, once when the clover is in full bloom, for 

 hay alone, and again in the autumn for seed. If the hay crop be 

 cut from two to three weeks earlier than usual the first generation 

 of the insect will be destroyed and the seed crop in the autumn 

 will not be affected, or at least only to a comparatively slight 

 extent. 



116 



