Biocontrol ofRhizoctonia damping-off of cucumber by non-pathogenic binucleateRhizoctonia

Abstract

Three isolates of binucleate Rhizoctonia (BNR) were tested for biological control of damping-off of cucumber seedlings caused by Rhizoctonia solani AG 2-2 and AG 4. BNR isolates L2 (AG Ba) and W1 and W7 (AG A) provided protection of 58 to 71% against virulent isolate C4 of AG 4 and 64 to 75% protection against virulent isolate RH 65 of AG 2-2. Varying protection was provided to the seedlings by the BNR isolates against the virulent R. solani from the two AGs depending on their combination. The BNR isolates did not vary in providing protection to the seedling when tested against virulent C4 when both isolates were inoculated using three different methods, viz. in water agar, combination of water agar and soil and using soil alone. Protection of 58 to 71% was provided by the isolates when inoculation was done on the hypocotyl using water agar, 62.8 to 75% using the combination of water agar and soil, and 75 to 85% when inoculation of both isolates was done in soil. Pre-incubation of BNR W7 or delayed inoculation of C4 (from 0.5 day to longer duration) using the different methods provided an increased protection to the seedlings to give complete inhibition of damping-off disease. Simultaneous inoculation of both BNR W7 and C4 using the three methods failed to provide protection to the seedlings. Among the BNR isolates, BNR W7 showed plant growth promotion in terms of significant increase in plant height (P = 0.0I) and fresh weight (P = 0.05).

Biocontrol of Chickpea Fusarium Wilt by Bacillus Spp. Rhizobacteria

“…The percentage suppression of Fusarium wilt was calculated according to the disease severity index (Villajuan-Abgona et al 1996). The FOC isolate, FOC1, was isolated again from wilted plants by plating stem pieces from the crown region onto PDA medium.…”

Screening rhizobacteria for biological control of Fusarium root and crown rot of sorghum in Ethiopia

“…Chemical control of sorghum diseases is also unaffordable in most developing countries. The use of broad-spectrum fungicides further results in imbalances within the microbial community creating unfavorable conditions for the activity of beneficial organisms (Villajuan-Abgona et al, 1996).…”

Induce Systemic Resistance against Root Rot and Wilt Diseases in Fodder Beet (Beta vulgaris L. var. rapacea Koch.) by Using Potassium Salts

“…Plant pathogens have caused an almost 20% reduction in the principal food and cash crops worldwide [4,22].…”