200 



GARDEN FOES. 



may afterwards be u«ed a«. iiiamirL'. Anotlier suggefstion 

 is not to grow turnips on the same land for several ^ears 

 until the bacteria has been starved out. 



White Rust (Cystopus candidus).— A fungus which 

 attacks the foliage of radishes, cress, cabbage, and horse- 

 radish, causing the parts affected to be distorted, and 

 more or less snowy-white in colour. 



Eemedy.— Gather and burn every infected leaf. The 

 fungus can only attack plants whilst in their seedling 

 stage. 



CHAPTER III. 



POTATO PESTS. 



A._INSECTS. 



Colorado Beetle (Doryphora decemlineata).— A pest 

 of American origin. The female beetle is just under half 

 an inch in length, the male being slightly smaller, and 

 the colour is yellow marked with five longitudinal dark 

 lines on each wing-case. The legs are red, and the wings 

 of a rosy tint. The eggs are oval, orange in colour, and 

 deposited in clusters of nine to forty under each leaf. The 

 larvae are of a dull reddish-brown colour, and about an 

 inch long when fully grown. They feed ravenously on 

 the foliage till they attain maturity, then descend and 

 pupate in the soil. In America several broods are pro- 

 duced in one season. The beetles are very hardy, and 

 survive the winter in the soil or among rough herbage. 



Kemedie.s. — Fortunately, this pest has not been seen in 

 this country for many years, but if it should make its 

 appearance it is well to remember that under the Destruc- 

 tive Insects and Pests Act, 1908, immediate notification 

 thereof must be sent to the local inspector of the Board 

 of Agriculture. See Chapter V., Part VII. 



