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棉花病害发生种类多,为害期长。防治棉花病害应采取“预防为主,综合防治”的方针,通过选用抗病品种、加强肥水管理以及创造不利于病害发生的环境条件等综合措施,辅以科学的化学防治,实现经济、安全、有效的目标。病害与药害以及由于气候、肥、水、缺素及管理不当产生的生理性症状的主要区别:病害症状在田间先表现零星株,再表现出点片发生,后期
Cotton disease occurs more types, long period of harm. Prevention and control of cotton diseases should take the principle of “prevention first, comprehensive prevention and control”, through comprehensive measures such as selecting resistant varieties, strengthening fertilizer and water management and creating environmental conditions unfavorable to disease occurrence, supplemented by scientific chemical prevention and control to achieve economic, Safe and effective target. Disease and phytotoxicity and the main differences of physiological symptoms due to climate, fertilizer, water, lack of quality and improper management: The symptom of disease shows sporadic strain first in the field,