THE CULTURE OF GREEN CROPS. 81 



out when strong enough, and transplant a number of 

 the thinnings to a cold frame, 3 inches apart, to stand 

 the winter and be planted out in April. Sow in a 

 box under glass in February, transplant into other 

 boxes, and grow on in a moderate temperature; 

 harden off and plant out in April. Sow in the open 

 in March, and every four or five weeks for succession 

 up to the end of June. The seed should be sown 

 very thinly in shallow drills 1 foot apart, and the 

 plants thinned early to 8 inches. The thinnings 

 should be carefully lifted and transplanted into any 

 vacant ground that may be available, or between 

 the rows of peas and other vegetables. 



Cabbage Varieties : Sutton's Favourite, All the 

 Year Round, Commodore Nutt, and Wonderful. 



Cos Varieties : White Heart, Peerless, Paris White, 

 and Paris Green. 



PESTS AND DISEASES. 



Cabbage White Butterflies (Pieris sp.). These 

 well-known insects lay their eggs on the leaves of 

 cabbages, and the caterpillars which hatch out 

 devour the foliage. In a severe attack the plants 

 may be rendered quite useless. There are two 

 broods in the season, and the second, which appears 

 in August, is often the most destructive. The in- 

 sect passes the winter in the pupal stage, under 

 rubbish or in the soil. 



Treatment. No poisonous spray is permissible on 

 these plants. Hellebore or pyrethrum powder may 

 be dusted over the leaves, when damp, but these 

 must not be used within three weeks of the vegetables' 

 being cut for eating. If young plants are attacked, 



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