54 



syringed forcibly round the roots, and the earth was quickly pushed up 

 again round the stem. The result of the treatment was that only about 1 

 per cent, of the cabbage was lost." 



Cabbage Maggot; a, larva; b, pupa; c, adult. (Riley). 



Sand barely moistened with coal oil placed closely about the base of 

 the plants, immediately after transplanting, is often effective with cab- 

 bages, but must be repeated each week until the middle of July. 



Carbolic acid emulsion is sometimes used with success. Hollow out the 

 earth about the plant and apply plenty of carbolic acid emulsion diluted 

 with thirty parts of water. Apply first just after plants are up or the day 

 after they are set out, and repeat every week until the first of June, 



For the Onion Maggot, the above spray with hellebore or pyrethrum 

 powder is as effective as any I can suggest at present. Carbolic acid emul- 

 sion used in the same way is sometimes effective. It is sprayed along the 

 rows once a week. Hellebore dusted along the rows once a week is some- 

 times effective on onions and radishes. 



It has been recommended to pour thick whitewash along the rows as 

 soon as the onions are above the surface, with the object of closing up all 

 cracks and preventing the maggots from penetrating to the roots. 



The same maggot works in cabbages, turnips and radishes, and these 

 crops should be as far as possible from soil which has been infested the 

 previous season. Onions should not be planted on land which contained 

 the onion maggot the year before. 



Tobacco dust applied liberallj^ about the plants when set out or when 

 just above the ground is useful. A quick-acting fertilizer, such as nitrate 



