National Academy of Agricultural Sciences (NAAS)
|
PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A scabbed leaf collected on 30 April was the most effective date that results 25 percent partial decomposition. The partial decomposition rate was observed low in the month of May with collected leaves on 30 Dec. (0.37 %), 30 Jan. (3.51 %), 28 Feb. (9.76%), and 30 March (18.01 %) at Jochira, Gangotri Fruit valley of District Uttarkashi, Uttarakhand. The interaction between collection date and category was found highly significant. Eighteen micro-organisms were isolated and identified to parasitize saprophytically on apple leaves but only four isolates namely, Athelia bombacina, Trichoderma harzianum, Chaetomium globosum, and Myrothecium roridum were further evaluated for their effect on reducing primary inoculums of V. inaequalis. A single pre-leaf fall spray of 5 % urea was significantly decomposed the over wintered leaves, and were on par or superior in effectiveness as compared to the 100 % cow urine, antagonists and carbendazim. Similarly, the application of urea at 3 and 5 percent was significantly proved better over others for reducing the pseudothecial formation (97.31, 78.72 %) and the discharge of ascospores (98.04, 95.66 %) from over wintered leaves. Among the four antagonists, A. bombacina was highly effective in reducing the development of pseudothecia (69.57%) and ascospore productivity (84.31%).The application of Sterol-biosynthesis inhibiting fungicides at a lower dose gave maximum (83 to 89 %) inhibition of ascospores discharge as compared to other fungicides was also recorded. This study indicated that urea/ antagonist (Athelia bombacina) spray could be safely applied during leaf fall stag of apple tree and orchard floor for the management of primary inoculum of V. inaequalis
Citations |
 |
 |
 |
 |
