Yogendra Singh , R. K. Verma , Jamaluddin

Abstract

A field experiment carried out to investigate the effect of biocontrol agents, plant products and biofertilizers including Trichoderma pseudokoningii, T. polysporum, Aspergillus flavus, Vitex negundo extract, Jatropha cake, Arbuscular mycorrhizal fungi and Rhizobium showed a significant increase in germination, height and collar diameter and reduction in mortality of D. sissoo seedlings due to Fusarium wilt in a number of treatment combinations. The results indicated that applications of T. pseudokoningii, AM fungi, Rhizobium and Jatropha cake in combination may be recommended for management of vascular wilt disease and production of quality seedlings of D. sissoo.

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Yogendra Singh

Abstract

Sclerotium leaf blight an important disease of Gmelina arborea L. caused by Schlerotium rolfsii Sacc. was successfully controlled by Trichoderma based biocontrol agents in-vitro.

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Yogendra Singh

Abstract

Diseases caused by fungi in D. macrocarpus and Gmelina arborea in and around Jorhat, Assam were recorded during 1998-99. Disease incidence and percent infection index or disease severity were recorded and reported. Three fungal diseases in G. arborea namely leaf spot caused by Corynespora cassiicola, leaf blight caused by Sclerotium rolfsii and ischolar_main rot by Fusarium semitectum and in D. macrocarpus, a leaf blight caused by Colletotrichum crassipes were studied. Disease incidence of leaf spot, leaf blight and ischolar_main rot in G. arborea and leaf blight in D. macrocarpus was 95%, 80%and 73% respectively whereas disease severity of leaf spot and leaf blight in G. arborea and leaf blight in D. macrocarpus was 35%, 29.2% and 40.8% respectively. Leaf blight of D. macrocarpus is a new disease from India.

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Yogendra Singh , R. K. Verma , Jamaluddin

Abstract

A study was carried out in ischolar_main trainers to test the efficacy of different biofertilizers and biocontrol agents including Arbuscular Mycorrhizal fungi (AM), Rhizobium (Rh),four species of Trichoderma namely T. atroviride (Ta),T.sp.1,T.sp.2,T. polysporum (Tp) and one species of Aspergillus (As) against Fusarium wilt (seed rot and damping-off) of sissoo. Biofertilizers and biocontrol agents in various treatment combinations effectively controlled both seed rot and damping-off caused by Fusarium solani. Rhizobium alone with Aspergillus sp. Treatment was found the best to check the disease development while AM fungi, Rhizobium and T. polysporum in combination was the best among all treatments in checking the disease as well as promoting the growth.

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