Mancha foliar e míldio do algodão e sua gestão

Mancha foliar e míldio do algodão e sua gestão

Gopal Chopada / Ishita Hirpara / Rasikbhai Kapadiya

65,68 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2025
Materia
Botánica y ciencias de las plantas
ISBN:
9786208490546
65,68 €
IVA incluido
Disponible

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O algodão (Gossypium sp.) é uma das culturas de rendimento de fibras mais importantes da Índia e do mundo.Sabe-se que esta cultura sofre de várias doenças. A doença produz pequenas manchas castanhas circulares necróticas nas folhas, com uma auréola arroxeada, que se expandem até cerca de 1 cm de diâmetro, tornando-se o centro cinzento e fissurado. Por fim, as manchas aumentam de tamanho, o que mais tarde resulta na desfoliação das folhas.O agente patogénico tem um crescimento lento e micélio aéreo septado e hialino. Os conidióforos mediam 30-132 x 5,2-7,9 µm. Os conídios, retirados diretamente do hospedeiro, mediam 24,8-124,6x 7,3-21,8 µmincluindo o comprimento do bico. Com base nas caraterísticas morfológicas, o fungo foi identificado como Alternaria macrospora Zimm. Em condições in vitro , o fungicida sistémico tebuconazol foi considerado o fungicida mais eficaz e inibiu (100%) o crescimento micelial. O tebuconazol (0,0375 %) provou ser o melhor no controlo da doença (82,66 %) in vivo, onde foi registada uma intensidade mínima da doença (5,66 %), resultando num maior rendimento do algodão (6331,02 kg/ha).

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