MANAGEMENT OF FRUIT ROT OF BRINJAL WITH FUNGAL BIO-FORMULATIONS
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Date
2019-07
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AAU, Jorhat
Abstract
Fruit rot of brinjal is one of the most destructive disease causing severe damage to the fruits in the field and considerable losses during storage, transit and marketing.The causal fungus of fruit rot of brinjal was identified as Phomopsis vexans
in the mycology laboratory, Department of Plant Pathology, AAU, Jorhat. The present investigation aimed at managing the disease by using few liquid fungal bio-
formulations in in vitro and pot condition. Three bio-formulations viz. Org-Trichojal (Trichoderma harzianum), Org- Beauverijal (Beauveria bassiana), Org- Metajal (Metarhizium anisopliae) were tested alone and in combination with each other and Carbendazim (0.1%) was used as fungicidal check against Phomopsis vexans by ‘poisoned food technique’. Carbendazim 0.1% recorded the highest inhibition of mycelial growth (94.11%) followed by combination of Org-Trichojal + Org-Beauverijal + Org-Metajal (91.44%), Org-Trichojal + Org-Beauverijal (79.11%), Org-Trichojal + Org-Metajal (78.22%), Org-Trichojal (77.78%), Org-Beauverijal + Org-Metajal (76.22%), Org-Beauverijal (74.67%) and Org-Metajal (66.67%), respectively over the control. Amongst the fungal bio-formulation treatments, the effect of Org-Trichojal + Org-Beauverijal + Org-Metajal was found to be significantly superior over rest of the treatments. Therefore, this treatment was selected for further studies. The bio-
formulation was evaluated for their effect on seed germination, root length, shoot length and seedling vigour of brinjal and compared with Carbendazim (0.1%) and control. Seed treated with Carbendazim resulted highest values in all the parameters followed by seed treated with bio-formulation over control. In pot culture condition, bio-
formulation was also evaluated for their effect in managing the disease and was compared with Carbendazim (0.1%). Seed treatment + foliar spray with Carbendazim gives the lowest disease incidence and percent disease index (8.03% and 6.13%). This was followed by seed treatment + soil treatment + foliar spray with the bio-formulation (8.06% and 7.19%) over control which were statistically at par in their effect. Highest yield (1.45 kg/plant) was recorded in seed treatment + foliar sprays with Carbendazim followed by seed treatment + soil treatment + foliar spray with the bio-formulation (1.40 kg/plant). Amongst the bio-formulation treatments lowest yield was recorded in foliar spray with the bio-formulation (0.85 kg/plant). Use of bio-formulation in different method of application were found to be most effective and have greater proposition in managing fruit rot disease of brinjal caused by Phomopsis veaxns, but it ranked behind the chemical fungicide.