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Accueil du site → Master → Inde → 2000 → EPIDEMIOLOGY AND MANAGEMENT OF FIG RUST (Cerotelium fici (Cast.) Arth.)

University of Agricultural Sciences, Dharwad (2000)


Sreekantappa, H

Titre : EPIDEMIOLOGY AND MANAGEMENT OF FIG RUST (Cerotelium fici (Cast.) Arth.)

Auteur : Sreekantappa, H

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Master of Science in Plant Pathology 2000

The survey of the fig rust disease in three districts of Northen Karnataka revealed that the disease was more severe in Koppal than Bellary and was least in Raichur. Koppal district was a hot spot for fig rust disease during 1999-2000.Uredospore germination was maximum after 24 hrs of incubation. The temperature range of 25-30’^C and a relative humidity of 86-100 per cent were the most ideal conditions for maximum uredospore germination.There was a greater increase in disease index during August to October, the period with increased cumulative rainfall (r=0.937) with higher number of rainy days (r=0.956) having high relative humidity which have significantly influenced the disease development, A step wise multiple regression analysis indicated an R^ value of 0.878, 0.914 andO.915 with cumulative rain fall (xi) , cumulative rainy days (X2) and combined effect of the two factors respectively. These factors combined with maximum relative humidity accounted for an R^ values of 0.918. Thus the best mathematic equation with high fitness were identified as Y=-6.478+1.704x1 ,Y=7.362|+4.55x2 and Y=4.897+0.256 Xi +3.90x2 The two varieties, Bellary and Poona behaved in a similar fashion to all the components of slow rusting viz AUDPC, latent period, uredium size, uredospore per uredium, number of uredia per cm""^ and hence none of them could be designated as slow ruster. The total phenol, orlho-dihydroxy phenol, reducing sugar and non-reducing sugar contents were high in diseased sample of Bellaiy and Poona varieties as compared to healthy samples.In the in vitro evaluation of fungicides, mancozeb and chlorothalonil among non-systemic fungicides and Hexaconazole, Propiconazole and Tridemorph among systemic ones were very effective in inhibiting the uredospore gennination. In the in vivo evaluation, Hexaconazole recorded least (31 % ) disease index followed by Propiconazole (41 %), Tridemorph (42.66%), Chlorothalonil (45 %) and need based spray of Mancozeb (43 %). However, Triadimefon and Wettable Sulphur were least effective with 67.00 % and 63 % disease indices, respectively."

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