Insect Pests and Plant Diseases. 



191 



cut all wild asparagus plants in vicinity once a week. Rust may be partially con- 

 trolled by spraying with Bordeaux, 5-5-50 containing a sticker of resin-sal soda 

 soap (See page 202), but it is a difficult and expensive operation and probably 

 not profitable except on large acreage. Begin spraying after cutting as soon as 

 new shoots are 8 to 10 inches high and repeat once or twice a week until about 

 September 15. See Geneva Bulletin 188. Dusting with sulfur has proved effective 

 in California. See California Bulletins 165 and 172. Plant 'the varieties least 

 aft'ected by rust. 



BEANS. 



A fungous disease com- 

 Anthracnose monly known among grow- 

 er pod-spot, ers as "rust." It is carried 

 over from one season to 

 another in the seed. Plant clean seed 

 obtained by selecting pods free from the 

 diseased spots. Hand-sorting of seed, and 

 seed treatment will not control this disease. 

 When beans can be thoroughly hand-sprayed 

 Bordeaux, 5-5-50, will control the trouble. 

 Spray, first, just wjien the plants break 

 through the ground ; second, when first pair 

 of leaves are expanded; third, when the pods 

 have set. See Cornell Bulletin 239, also New 

 Jersey Bulletin 151. (Fig. 166.) 



A bacterial disease. Like 

 Blight. the anthracnose, blight is 



carried over in the seed. It 

 is difficult to control. It affects the leaves 

 chiefly, forming large dead spots. Spraying 

 with Bordeaux, as for anthracnose, is said 

 to reduce the injury. See Cornell Bulletin 

 239 and New Jersey Bulletin 151. 



•">:, 



Fig. 164. Blight canker of apple. 



CABBAGE — CAULIFLOWER. 



In this bacterial disease, bacteria get into the sap-tubes of the 



Black-rot. leaves clogging them and turning them black ; the plants drop 



their leaves and fail to head. Practice crop rotation ; soak seed 



15 minutes in a solution made by dissolving one corrosive sublimate tablet 



in a pint of water. Tablets may be bought at drug stores. See Geneva 



Bulk-tins 232 and 251. 



This is a slime mold disease. The parasite lives in the soil. 

 Club-root or Practice crop rotation. Set only Iiealthy plants. Do not use 

 club-foot. manure containing cabbage refuse. If necessary to use in- 

 fested land apply good stone lime, 2 to 5 tons per acre. Apply 

 at least as early as the autumn before planting; two to four years is better. 

 Lime the seedbed in same manner. See New Jersey Bulletin 98. This disease is 

 sometimes confused with cabbage maggots, which see. (Fig. 167.) 



