Septoria, 

 leaf-spot. 



Rust. 



354 



CHRYSANTHEMUM. 



This is also a fungous disease. Spray with Bordeaux, 5-5-50, 

 every ten days or often enough to protect new foliage. Am- 

 moniacal copper carbonate may be used but it is not so effective. 

 See Geneva Annual Report 1892, p. 558. 

 Treat as for leaf-spot. Avoid wetting foliage when watering. 



CUCUMBER. 



This is a disease caused by bacteria that get into the sap-tubes 

 Wilt. of the leaf and stem, clogs and destroys them, causing the plant 



to wilt. The bacteria are distributed chiefly by striped cucum- 

 ber beetles. Destroy the beetles or drive them away by thorough spraying with 

 Bordeaux,s-5-5o. Gather and destroy all wilted leaves and plants. The most 

 that can be expected is that the loss may be slightly reduced. 



This most serious fungous disease of the cucumber is known 

 Downy among growers as " the blight." The leaves become mottled 



mildew. with yellow, show dead spots and then dry up. Spray with 

 Bordeaux, 5-5-50. Commence spraying when the plants begin 

 to run and repeat every 10 to 14 days throughout the season. See Geneva Bulle- 

 tins 119 and 156. 



CURRANT. 



This is caused by two 

 Leaf-Spots and or three different fungi. 

 anthracnose. The leaves become spot- 

 ted, turn yellow and fall 

 prematurely. It may be controlled by 

 three to five sprayings with Bordeaux, 

 5-5-50. but it is doubtful whether the 

 disease is sufficiently destructive on the 

 average to warrant so much expense. 

 Upon the first jippearance of currant worms 

 spray with Bordeaux and Paris green (i lb. 

 to 100 gals, or arsenate of lead, 4 lbs. to 

 100 gals). Repeat if a second brood of 

 worms appears. See Iowa Bulletin 30 and 

 Geneva Bulletin 199. (Fig. 168.) 



^^^ destructive in the Hudson Valley. Canes die suddenly 

 Cane-bhght while loaded with fruit and leaves like those attacked by the 

 or wilt cane borer. Caused by a fungus which kills the bark, in 



places and discolors the woo^ No definite hne of treat- 

 ment has been established, but the following is suggested. Beginning*when 

 the plants are small go over the plantation three or more times every summer 

 and cut out and bum aU canes showing signs of disease. See Geneva Bulletin 167, 

 p. aga. ' 



|-.,v....«*a 



Fig. 168. Currant leaf-spot. 



