Cotton – Page 6 – Gramophone

Potash Deficiency and Their Control in Cotton

23/07/2018

Potash deficiency and their control in Cotton :-

Prior to peak bloom, potassium deficiency in cotton presents itself as interveinal chlorosis on older leaves. These areas of interveinal chlorosis can progress to a red/gold color on these leaves followed by necrosis and/or the onset of foliage disease symptoms Due to potash deficiency, shading of leaves is observed also boll opening is not proper. Leaves get curled and become dry.

Control:- Spray Two to three times 00:52:34 or 00:00:50 @ 100 gm per pump.

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Phosphorus Deficiency in Cotton

18/07/2018

Phosphorus Deficiency in Cotton:-

Leaves of Phosphorus deficient plants remain dark green in colour with reduced leaf size. The deficiency symptom is first reflected in the lower or older leaves of cotton plant. The deepening of the green colour of the leaves progresses upward towards to the growing point to the extent phosphorus is deficient, suggesting that the nutrient moves to younger tissues as the supply diminishes. An extreme deficiency of phosphorus not only reduces the plant size, but also suffers from lack of secondary branches and reduction in boll number. It also leads to delay in blooming, fruiting and maturity of the bolls.

Younger Leaves show more dark green appearance. Older leaves become small in size and developed purple and red pigmentation.

Control:- Spray 12:61:00 or 00:52:34 @ 100 gm per pump.

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Nitrogen deficiency in Cotton

12/07/2018

Nitrogen deficiency in Cotton:-

A pale yellowish green colour, coupled with reduction in leaf size is the most striking symptom of nitrogen deficiency in cotton. Eventually, the cells become disorganised accompanied by development of red pigments called anthocyanins. Nitrogen deficient plant is also characterized with little vegetative growth, lack of vigour coupled with stunted growth.

Control:- Spray 19:19:19 @ 100 gm per pump.

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Integrated Management of Pink Bollworm in Cotton

11/07/2018

Integrated Management of Pink Bollworm in Cotton:-

Terminate cotton crop by December – mid January.
Do not store infected or stained cotton in house / godowns.
Crop rotation should be followed to break the life cycle of pink bollworm.
Install pheromone traps @5/ha, after 45 days of sowing for monitoring month activity of pink bollworm larvae within flower.
At boll formation stage, farmers are advised to inspect presence and damage of pink bollworm by plucking 20 green bolls from different plants randomly.
picking of clean and infected cotton may be carried out separately clean cotton may be stored or marketed. Infected cotton should be destroyed.
One spray of neem seed kernek extract 5%+neem oil 5 ml/lit. may be taken up at 60 days after sowing.

Table:- Insecticide suggested for Pink Bollworm Management

Month	Insecticide	Dose per 10 Litre of Water*
September	Quinalphos 25 EC Thiodicarb 75 WP	20 ml 20 gm
October	Chlorpyriphos 20 EC Thiodicarb 75 WP	25 ml 20 gm
November	Fenvalerate 20 EC Cypermethrin 25 EC	10 ml 10 ml

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Bacterial Blight of Cotton

10/07/2018

Bacterial blight of cotton-

Symptoms –The symptoms of this disease appear on top of the leaves, stems and cotton bolls, in which all the aerial parts of the plant have black and light brown spots. As the disease progresses, small spots are found in large wounds, the bacteria enter the leaf nerves. Chlorophyll is eliminated due to the spots of the leaves, which the plant is unable to make food.

Control –Spray twice Streptomycin+ tetracycline @ 2 gm/pump or kasugamycin 30 Ml./pump at 7-10 days intervals.