26 



If the maggots succeed in getting a foothold, apply carbolic acid 

 emulsion or hellebore decoction as recommended just as soon as 

 their presence is observed, and if this is the only material used, 

 applications should be begim as soon as the plants are established 

 or when the eggs are noted and continued at intervals of five or six 

 days until all signs of the maggots have disappeared. In the case 

 of cabbage and caulifiower in gardens, the plants might be care- 

 fully removed, the roots Avashed in a soap or hellebore solution so 

 as to destroy the maggots, and the plants then reset. 



In all this work it must be borne in mind that the more maggots 

 are destroyed the less there will be to breed, and if active measures 

 are continued persistently for two or three years the infestation 

 may be reduced to so great an extent that keeping them down will 

 be an easy task. 



Exempt Varietiefr. 



It ap[)ears that some varieties of cabbage and cauliflower suffer 

 more from maggot attack than others, but except for the Holland 

 cabbages there are none, so far as we know, that will not be badly 

 injured by these pests. Both from our own State and elsewhere 

 the Holland cabbages are reported as being quite free from maggot 

 attack and need little, if anv, treatment. 



Enemies. 



Several species of predaceous beetles have been observed feeding 

 on the maggots in the field, while minute parasitic wasps and 

 predatory mites have been found infesting the eggs in great -num- 

 bers. It is certain that many of the pests are thus destroyed, but 

 practically the benefit derived by the farmer is relatively small, 

 as is evidenced by the large amount of injury done by the maggots 

 each year. None of them can be relied upon to relieve the grower 

 from the necessitv of active w(irk in liis own be]jalf. 



