CULTURE OF BULB AND STEM CROPS. 105 



ease occurs first in the form of yellowish patches, 

 and later as a white mould, on the leaves. The 

 leaves shrivel and the growth of the bulb is arrested. 



Treatment. (1) Promptly pull up and burn affected 

 plants. (2) Dust surrounding plants, or the entire 

 crop, heavily with powdered quicklime and sulphur, 

 in the proportion of 1 of lime to 2 of sulphur, when 

 the foliage is moist. (3) Spray with a solution of 

 liver of sulphur (sulphide of potassium), at the rate 

 of 1 oz. in 2 gallons of water. 



Turnip Flea Beetle (Haltica nemorum). This pest 

 attacks the seedlings immediately they appear above 

 ground. It is popularly known as the " Turnip 

 Fly," and feeds on the seedlings in the adult insect 

 state. 



Treatment. (1) Hasten the plants into the rough 

 leaf by good cultivation, as already advised. (2) As 

 soon as the seedlings appear, dust along the rows 

 with lime and soot. 



Turnip Sawfly (Athalia spinarum). The larvae 

 of this pest attack the young plants at a somewhat 

 later stage in their growth. They are white at first 

 and gradually turn dark in colour. 



Treatment. (1) Stimulate rapid growth by means 

 of a nitrogenous fertiliser, watering it in. (2) With 

 a birch broom detach the caterpillars from the leaves, 

 when they will be unable to regain their position. 

 (3) Dust the foliage with lime and soot, or with 

 hellebore. 



Club Boot (Plasmodiophora brassiccs). This disease, 

 also known as Finger and Toe, frequently attacks 

 turnips. For treatment, see under GREEN CROPS. 



Celery Fly (Acidia heraclei). This insect attacks 



