194 



Bulletin 2^2. 



CHRYSANTHEMUM. 



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

 Septoria, ever,- ten days or often enough to protect new foliage. Am- 

 leaf-spot. moniacal copper carbonate maj- be used but it is not so effec- 

 tive. See Geneva Annual Report 1892, p. 558. 

 Rust. 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 



cucumber beetles. Destroy the beetles or drive them away b\- thorough spra^-ing 



with Bordeaux, 5-5-50. 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. '^^'ith yellow, show dead spots and then dry up. Spra;,- 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 



Bulletins 119 and 156. 





V 



CURRANT. 



This is caused by two 



Leaf-spots andor three different fungi, 

 anthracnose. The leaves becom.e 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 tirst appearance of currant zcorm 



spray 'ix-ith Bordeaux and Paris green (i 



lb. to ICO 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.) 



Very destructive in the Hudson Valley. Canes die suddenly 

 Cane-blight 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 wood. No definite line 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 burn all canes showing signs of disease. See Geneva Bulletin 



1-67, p. 292. 



Fig. 168. Currant leaf-spot. 



