i6o 



v/ill commence to deposit her eggs in the stored seed, and in this way- 

 several generations a year are produced. As many as ten or fifteen 

 insects may be found in an individual bean. It is evident, then, that 

 unless precautions are taken every seed may soon become " buggy " 

 and be rendered useless either for seed or consumption. This in- 

 sect does not injure the plant or the edible pod. Serious injury 

 to the stored seed may be avoided by fumigation with carbon 

 bisulphid. The seed as soon as harvested is placed in a tight box 

 or bin and the liquid placed on top of the grain in shallow dishes in 

 the proportion of about 2 lbs. to 1,000 cubic feet. The bin is covered 

 over with blankets, oilcloth, or such material, and left for twenty- 

 four or thirty-six hours. This treatment does not injure the seed for 

 any purpose. 



Other insects. — -The bean ladybird {Epilachna corrupta, Xuls.), 

 the bean leaf-beetle {Ccrotoma trifurcata, Forst.), and one of the 

 blister beetles (Macrobasis unicolor, Kby.) are occasionally found 

 feeding upon the foliage. They are easily kept in check by the 

 use of any of the arsenicals. During the past season one of the 

 leaf-hoppers {Empoasca fahac, Harr.) was abundant and did con- 

 siderable damage by sucking the juice from the foliage. Xo injury 

 was observed where the plants were sprayed with Bordeaux mix- 

 ture. 



Diseases of the Bean. 



Anthracnosc {Glocosporiuui liiidciiiuth iajiitiii, Pass.). — This is 

 by far the most common, and, because of the difficulty in treating it, 

 the most serious enemy of the bean. It is commonly called " pod 

 spot," and unfortunately in Xew York State the name " rust " 

 is frequently applied to it. The " rust " is an entirely different 

 disease, mention of which will be made later. The anthracnose 

 is caused by a fungus which first appears on the leaves and pods 

 as brown specks, and later as sunken ulcers which increase in size 

 and unite, forming large blotches. It is more noticeable on the pods, 

 rendering them unsalable. Infection not only takes place in the 

 field, but in the basket on the way to market or factory. The 

 disease is carried over in the seed, and in refuse remaining in the 

 field. 



With our present knowledge the disease cannot be prevented, but 

 it can be partially held in check by three thorough applications of 

 Bordeaux mixture. The essential part of this treatment lies in 

 commencing to spray soon after the first true leaves of the plant 



