COTTON 173 



tacked. The first appearance of the disease is a 

 peculiar yellowing of the leaf which assumes a 

 checkered appearance. As it gains ground, the 

 leaf not infrequently curls up and falls. 



The most effective remedy is to keep the plant in 

 good growing condition. Cultivation is effective, 

 since it warms the soil, dries the upper layer, and 

 provides an effective mulch during seasons of 

 drought; or an addition of vegetable matter, im- 

 proving the physical conditions of the soil and 

 thereby favoring the plant, is an effective help in 

 carrying the plant through the danger, and en- 

 abling it to resist the disease. 



Red Rust: The reddening of leaves often noted 

 in parts of cotton fields is the result of attacks by 

 the red spider. As a rule, this trouble is limited 

 in area extent, and it is not a prominent disease. 

 Dry, warm weather favors the increase and growth 

 of the spiders, and hence any treatment that causes 

 vigor and steady growth in the plant is a safe and 

 effective remedy. 



Angular Leaf Spot: This disease is largely con- 

 fined to the months of June and July, and while 

 it nowhere appears to any appreciable extent, 

 it is found in a very large territory. It gets its 

 name from the dark angular spots which appear on 

 the leaves. The disease does not extend to all of 

 the leaves, but usually only to those that are older 

 and less active in growth. The spots are watery at 

 first, but in time assume a blackish and then a 

 brownish color. Those plants that are less vigor- 

 ous and therefore constitutionally weak are usually 

 the natural prey of the disease. The selection of 

 strong seed, with careful cultivation, giving a good 

 growing environment for the plant, is suggested as 

 the best means of warding off the malady. 



