ONION PEA CH 275 



Pea. MILDEW (Erysiphe polygoni). A powdery mildew on pods and 

 leaves. 



Control. Dust dry sulfur over the plants, repeating the opera- 

 tion if necessary. 



POD SPOT AND LEAF-SPOT (Ascochyta pisi). Black circular spots on 

 stems, leaves, and buds. The fungus grows through the pod into 

 the seed, and is thus carried through the winter. 



Control. Select pods Tree from spots, and save the seed from 

 these for the next year's planting. On a large scale have a clean 

 seed garden in which to grow clean seed for the following year. 

 Peach. BLIGHT (Coryneum beyerinkii). A spotting, gumming 

 and death of the buds and twigs, particularly in the lower 

 part of the tree. The fruit drops. -Especially serious in Cali- 

 fornia. 



Control. For California conditions two applications of spray 

 are made : (a) in November or December, and (6) in February or 

 March. This also controls leaf-curl. Bordeaux mixture, 5-5-50, 

 or lime-sulfur, 1-10, may be used. 



BROWN-ROT (Scerotinia fructigena). Causes a rot of the fruit, and 

 often runs down the spur, forming a canker in the limb. Also 

 produces brownish irregular spots on the leaves. 



Control. Spray with self-boiled lime-sulfur, 8-8-50, adding 

 2 pounds of arsenate of lead. Spray first about time shucks are 

 shedding from young fruit; second, two to three weeks later, and 

 third, about one month before the fruit ripens. Omit the arsenate 

 of lead from the third spraying. On early maturing varieties two 

 applications may be sufficient. Spraying within a month of 

 picking time is apt to leave the fruit spotted. It is especially im- 

 portant that sprayings be made before a continued storm period. 

 Destroy rotten peaches. The rotten ones on the ground are as 

 great a menace (especially if plowed under) as. those on the tree, 

 as the fungus winters readily on the fallen mummies. Brown-rot 

 also occurs on cherries, plums, apricots, and sometimes on apples 

 and pears. 



LEAF-CURL (Exoascus deformans}. Causes the leaves to crimp and 

 curl and often to turn bright red. Also causes shoots to swell 

 and become distorted. 



Control. In an infected orchard more than 90 per cent of 



