EFFECT OF ENVIRONMENTAL FACTORS IN RELATIONSHIP TO BACTERIAL LEAF BLIGHT (BLB) DISEASE DEVELOPMENT UNDER SOUTH GUJARAT OF INDIA

Prashant B. Sandipan¹*, P.S. Patel², R.K. Patel³, Rameela I. Chaudhari⁴, P.V. Patil

and M.C. Patel⁵

^{1, 2, 4 & 5} Main Cotton Research Station (MCRS), Navsari Agricultural University (NAU),

Surat 395 007 (Gujarat), India

³Krushi Vigyan Kendra, Navsari Agricultural University (NAU), Surat 395 007 (Gujarat), India

Received-31.05.2022, Revised-12.06.2022, Accepted-22.06.2022

Abstract: Cotton (Gossypium spp.) is one of the most important economic products of the group of fibers due to volume and value of production. Its cultivation is also of great social importance, due to the number of jobs generated directly or indirectly. The fiber, the main product of cotton has many industrial applications. Examples are manufacturing of yarn for weaving of various kinds of fabrics, cotton batting for hospital use, felt clothing, blankets and upholstery, photographic films and plates for radiography and others. The Main objective of present study is to study the progress of the Bacterial blight disease of cotton (BLB), caused by Xanthomonas campestris pv. malvacearum (Smith) Dye, inrelation to the weather factors. Itis a common disease affecting the growth, development and the yield of cotton crop under this region. Afield trial was laidto study and to determine the influence of environmental factors viz., rainfall, rainy days,temperature and humidity on development of disease. the disease was first appeared in the third week of July (2.0 % PDI) i.e. in 29^th Met. week. The incidence of Bacterial blight disease (BLB) was noticed from 29^th to 51^st standard week with the maximum disease intensity in the second week of October (42.5% PDI) i.e. in 41^th Met. week.Bacterial leaf blight (BLB) has positive correlation with the maximum temperature and sunshine hour for the disease development.

Keywords: Bacterial blight, Xanthomonas,Campestrispv. malvacearum, Weather factors

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