20 MAINE AGRICULTURAL EXPERIMENT STATION. 



from the latter amounted to at least a million dollars in the 

 delta region in 191 3. In the mild climate of California a secon- 

 dary trouble follows the wilt and materially adds to the losses 

 from this cause. This is known as the "jelley end" rot and is 

 caused by other fungi and bacteria which gain entrance tihrougft 

 the lesions produced by the wilt fungus. 



In addition, they have two interesting animal pests, the tuber 

 moth and the nematode or eel worm. The former makes large 

 tunnels or channels in the fleslh of the tuber, while the latter 

 attacks the surface, giving it an uneven, knotty appearance. 

 Apparently the tuber moth is not so likely to attack the potatoes 

 in the moist soils of the deltas, before they are dug, as in the 

 dryer situations. One case was reported where only one or 

 two per cent of the crop was attacked when dug, but several 

 days after, 90 per cent of the culls left on the same field were 

 attacked by the tuber moth. 



