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. 
