20 SOME INSECTS INJURIOUS TO TEUCK 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. 
