20 SOME INSECTS TNJUETOUS TO TRUCK CROPS. 



periments should be made with some of the fish mentioned on page 15 

 as possibly useful for destroying cress insects. Ducks might also be 

 found valuable. Catfish were tried, but without avail. 



Mrs. Hannum has recently written that she attained the greatest 

 success by growing the water cress in running water which carried 

 the beetles away. In cold weather it was necessary to plant in 

 houses where the cress did well until the coming of warm and dry 

 weather, when the beetles would sometimes clean it out almost en- 

 tirely, leaving only the roots. By tearing the cress out of the houses 

 and in ponds which were not exposed to running water she could 

 replant her beds, and hoped in time to get rid of the pest. 



