Southern field crops (exclusive of forage plants) . elyapplicable means of warding off rust. On very poor sandysoils the application of potash usually enables the plantto resist the disease and to retain the greater part of itsfoliage until the crop is mature. For this purpose at least80, and better 100 pounds of kainit per acre is advisable,applied in connection with the other fertilizers which maybe required on that particular soil. Where the unthrifty condition of cotton plants is causedby poor drainage, ditching is usually a means of decreasingthe amount of rust. 388. Minor leaf diseases.
Southern field crops (exclusive of forage plants) . elyapplicable means of warding off rust. On very poor sandysoils the application of potash usually enables the plantto resist the disease and to retain the greater part of itsfoliage until the crop is mature. For this purpose at least80, and better 100 pounds of kainit per acre is advisable,applied in connection with the other fertilizers which maybe required on that particular soil. Where the unthrifty condition of cotton plants is causedby poor drainage, ditching is usually a means of decreasingthe amount of rust. 388. Minor leaf diseases. — Other diseases of the leaves,which are less destructive than cotton-rust, are angularleaf-spot (Fig. 184), which appears earher than rust; leafblight, in which the diseased areas show as small whitishspots ; and cotton viildeu, appearing on the under side of theleaves. No remedies are in use for any of these diseases. COTTOy JJISEASES 4iy 389. Sore-shin, or damping off Rhizodonia). — Thefungus causing this disease penetrates the stems of the. 1>54. -Dl^easei> Lza^es, Boll, axd Stems of Cotton Pl-\xt. ShoTring several forms of bacterial blight, known on the leaves as angu-lar leaf-spot ; on the stems as black aim : and on the bolls as bacterialboll-rot. verj young cotton plants just below the surface of the of the diseased plants die, while others is worse in wet weather. Any method of hastening thedr}-ing of the .surface soil is believed to be helpful. Thismay sometimes be done by passing a weeder or harrowacross the rows after the ground has dried sufficiently topermit this. The use of lime has been recommended ashelpful in combating a similar disease on certain othercrops, but its effects on cotton have not been investigated. 420 SOUTHEhN FIELD CHOPS LABORATORY EXERCISES The object of any laboratory work in connection witli thischapter should be to become acquainted with the appearancein the field of cotton plants attacked by any of these dise
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