6o8 



Bulletin 283. 



ONION. 



This mildew or blight, as it is commonly called, is a fungous 



Mildew. disease much like the blight of potatoes. Spray with Bordeaux, 



5-5-50, beginning when the plants show three leaves. Repeat 



every ten days until crop is harvested. Add one gallon sticker (see page 502) to 



every 50 gallons of the mixture. It is useless to begin spraying after the disease 



appears. Cornell Bulletin 218. 



This can be detected by the black pustules on the leaves and 

 Smut. bulbs. It is troublesome only where onions are grown exten- 



sively. It may attack the seedlings, killing them outright, or 

 may appear on mature bulbs in fall. Onions from sets or those started in clean 

 soil and transplanted seldom suffer. Practice crop rotation. Drill into the rows 

 when planting seed, 100 lbs. sulfur and 50 lbs. air-slaked lime mixed, to the acre. 

 Geneva Bulletin 182. 



Brown- rot. 



Fig. 216. 



i 



\ 



s 



^ 



PEACH. 



This is the most serious 



fungous disease of stone 



fruits in this state and one 



of the most difficult to con- 

 trol. Plant resistant varieties. Prune the 

 trees so as to let in sunlight and air. Thin 

 the fruit well. Spray with self -boiled lime- 

 sulfur, 8-8-50, (see page 501), to which add 

 2 lbs. arsenate of lead to 50 gallons. Spray 

 first about time shucks are shedding from 

 young fruit; second, 2 to 3 weeks after first, 

 using same combinations as for first; third, 

 about one month before fruit ripens, with 

 self -boiled lime-sulfur, 8-8-50, omitting the 

 poison. U. S. D. A. Bureau of Entomology 

 Circular 120. p. 6-7. 



This often proves trouble- 

 some in wet seasons and 



particularly in damp or 



sheltered situations. While 



this disease attacks the 

 twigs and leaves it is most conspicuous and 



injurious on the fruit where it appears as dark spots or blotches. In severe 

 attacks, the fruit cracks. In the treatment of this disease, it is of prime im- 

 portance to secure a free circulation of air about the fruit. Accomplish this 

 by avoiding low sites, by pruning and by removal of windbreaks. Spray 

 with self-boiled lime-sulfur, 8-8-50, applying at same time as for l>rown-rot. 

 (See page 501). 



This is a fungous disease in which the leaves become swollen 

 Leaf-curl. and distorted in spring and drop during June and July. 



Elberta is an especially susceptible variety. Easily and com- 



Black-spot 

 or scab. 



Fig. 217. 



Fig. 216. Mummies on peach tree 

 the result of brown-rot. 



