Economic Botany: Applied Plant Biology
Patel, Shaikhamar .
Incidence of air borne spores of alternaria and effect of climatic variation on early blight disease of tomato at Nashik, India.
The present studies deals with an observation on air borne Alternaria spores over tomato (Lycopersicum esculentum Mill) fields at Nashik was carried out during both kharif and rabi seasons i.e. January to April and July to October 2000 by using Tilak’s air sampler. The investigations were carried out mainly to assess correlation between the concentration of air borne Alternaria and its relevance to the disease incidence and the effect of prevailing weather variation such as temperature, relative humidity and rainfall. Maximum concentration of air borne Alternaria was recorded during moderate temperature between 15 C to 25 C, high relative humidity (75%- 95%) and dry days in rainy seasons. The incidence and development of early blight disease was highest above meteorological conditions. The disease symptoms were recorded more after 3-4 days of rain during the August and September 2000. The disease symptoms first occur first in the field and first record of Alternaria was noted on 15th July while symptoms appeared on 9th July 2000. Diurnal periodicity reveals that spores were recorded through out the day but rapid liberation occur at about 8.00 to 14.00 hrs reaching peak at 10.00 to 12.00 hrs. The disease was more severe in June to July 2000 than in winter sown crop (January 2000).In later case development was slow with low intensity. Lower leaves were noted more susceptible than upper leaves. Severe attach of fungus during August 2000 resulted in to defoliation exposing the fruits to sunscald. Highest concentration in the month of September 2000 (6.17 %) and January 2001 (2.68 %) is probably due to moderate rainfall, high humidity, low temperature, debris of decaying fruits around the field and harvesting activity of the crop respectively. Concentration of Alternaria spores shows correlation with disease development.
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1 - NDMVP Samaj\'s, Arts,Science and Commerce College, Saikheda, Dist : Na, Botany., 101,Satyabhama Hsg. Soc. Dwarka Nagari, Wadala Road, Nashik, M.S. India, Post : Saikheda, Tal : Niphad, District : Nashik., Nashik, Maharashtra , India, 91 253 25801120, India
Early blight of Tomato
Presentation Type: Poster:Posters for Topics
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM