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Mahatma Phule Krishi Vidyapeeth, Rahuri (2018)

EVALUATION OF PROMISING GENOTYPES OF BER (Zizyphus mauritiana L.) AGAINST PEST COMPLEX

Thorat Shekhar J.

Titre : EVALUATION OF PROMISING GENOTYPES OF BER (Zizyphus mauritiana L.) AGAINST PEST COMPLEX

Auteur : Thorat Shekhar J.

Université de soutenance : Mahatma Phule Krishi Vidyapeeth, Rahuri

Grade : Master of Science (MS) in Agricultural Entomology 2018

Résumé
The experiments on ‘Evaluation of promising genotypes of ber (Zizyphus mauritiana L.) against pest complex’ was carried out during the year 2017-18 at Instructional-Cum-Research orchard (19⁰20′36″ N, 74⁰39′38″ E), of Arid Zone Fruit Project, Department of Horticulture, Mahatma Phule Krishi Vidyapeeth Rahuri, Maharashtra. The overall peak intensity of leaf eating caterpillar and leaf webber was noticed during 31st-32ndmeteorological weeks and 33rd-34th meteorological weeks, respectively. Whereas fruit borer and stone weevil peak intensity among all genotypes was noticed during the 3rd-4th and 49th-50th meteorological weeks respectively. Gorfa was found significantly superior and registered maximum yield of ber fruits, (26.5kg/plant) followed by Illaichi and Ladu. Among the twenty five genotypes, Jogia and Darakhi No. 1 were found significantly superior in registering least damage due to leaf eating caterpillar and leaf webber respectively, whereas, Nalgari and Sanaur No. 5 found significantly superior in registering least damage due to fruit borer and stone weevil respectively, which could be used as best source of resistance in future. Among the twenty five genotypes screened for biochemical parameters, highest TSS and acidity found in Sanaur No. 5 (24.00 ⁰Brix) and Nalgari (0.44%) respectively, whereas lowest TSS and acidity was found in Seo (13.00 ⁰Brix) and Bagwadi (0.22%) respectively. Significantly highest TSS/Acid ratio found in Sanaur No.5 (75.10) whereas lowest TSS/Acid ratio noticed in Nalgari (34.55). Highest and lowest ascorbic acid content was recorded in Gola Gurgaon No.3 (92.42 mg/100g) and Sanaur No.5 (91.06 mg/100g) respectively.Highest and lowest reducing sugar was observed in Darakhi No. 1 (4.58%) and Sanaur No.5 (3.18 %). The highest total sugar was noticed in Sanaur No.5 (8.72%) while lowest total sugar content was noticed in Gorfa (5.96%). Strong negative correlation was observed between acidity (%) and fruit borer incidence (r=-0.87) as well as strong positive correlation was observed between reducing sugar (%) and stone weevil incidence (r=0.80). There was positive correlation between leaf eating caterpillar incidence and evening humidity (r= 0.72) as well as leaf webber incidence and evening humidity (r=0.74). Leaf webber incidence was found negatively correlated with maximum temperature (r=-0.74) and minimum temperature (r=-0.71). It was noticed that negative correlation exists between morning humidity and stone weevil incidence (r=-0.73), however remaining weather parameters did not found influence to the pest incidence.

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