TWO ONION MAGGOTS. 



19 



is said to affect crops grown on land where it is used. Such 

 spores, it is claimed, will live for two or three years in the 

 soil. Manure, tlien. is one of the means of infection. Soil, 

 it is claimed, transferred from one infected field to another, 

 will carry the spores, and thus infect the second field. Rota- 

 tion of cahhage crops with some other not of the same family, 

 care in choice of manure, the keeping down of all wild mus- 

 tard and other weeds of the same family, and avoiding the in- 

 fection of new fields hy the transference of soil or refuse from 

 infested fields, are all suggested as preventive or remedial 

 measures. The hroadcasting of air slaked lime, 75 bushels 

 to the acre, has given satisfaction. 



Fig. 11. — Club-root on mustard. (Author's illustration.) 



TWO ONION MAGGOTS. 



Previous to this year no maggots have been reported as in- 

 juring onions in Minnesota. We draw this conclusion from 

 a study of Dr. Lugger's reports, wherein we find no mention 

 of them, and the present Entomologist previous to this season 

 has had no complaints regarding them, nor has he met them 

 in the field. 



This summer, liowever, on August 6th infested onions were 

 received from Barnum, Carlton County, Minn., and on the 



