Volume 1 No. 1, 2011
 
 
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Insight Plant Disease>>  Volume 1 Issue 1, 2011
The Effects of Some Biocontrol Agents and their Combination on Root-knot Disease on Tomato
Hadi Golzary , Masuod Ahmadzadeh , Naser Panjehkeh , Mohammad Salari and Ebrahim Sedaghati-khoravi
 
Abstract: The effects of pseudomonas sp., Glomus sp., their combination and Trichoderma harzianum on root-knot disease reduction were investigated. In this experiments, combination of bacterial strains UTPF86 (P2) and 7NSK2 (p1) with species G. mosseae (G1) and G. intraradices (G2) (G2P2M, G1P2M and G1P1M) gave the best results. These treatments reduced the gall number, gall diameter and nematode penetration, followed by 78, 70, 60, 79, 69 and 60%, respectively (p<0.05). Bacterial strains 7NSK2 and UTPF86 produced the maximum of salicylic acid (inducing resistance agent) and hydrogen cyanide (agent of neurosis and maim) in in vitro (p<0.01) and mycorrhizal fungi induces the resistance. Therefore, it was expected that the combination of mention two agents would give the best effect in enhancement of plant growth and nematode biocontrol. Among combined treatments, T2Mt1, P2M and G1M gave the best results. These treatments reduced the gall number, gall diameter and nematode penetration, followed by 59, 48, 32% and 71, 60, 49% and 58, 48, 32%, respectively so that their effects were not significant (p<0.05). T1Mt2 was the worst treatment. However, this treatment reduced the gall number, gall diameter and nematode penetration, followed by 16, 12 and 17%, respectively so that its effects against the contaminated control was significant (p<0.05). The present study demonstrated that AM fungus and bacteria can coexist without adversely affecting one another. In fact, suitable combinations of biocontrol agents can further increase the plant growth and resistance to pathogens.
 
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    How to Cite:
Hadi Golzary, Masuod Ahmadzadeh, Naser Panjehkeh, Mohammad Salari and Ebrahim Sedaghati-khoravi , 2011. The Effects of Some Biocontrol Agents and their Combination on Root-knot Disease on Tomato. Insight Plant Disease, 1: 1-11
DOI: 10.5567/PLANTDIS-IK.2011.1.11
 
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