Is Use of Two Trichoderma Species Sole or Combined with a Plant Extract Effective for the Biocontrol Meloidogyne incognita on Potato and Soil Microorganisms Diversity?
Is Use of Two Trichoderma Species Sole or Combined with a Plant Extract Effective for the Biocontrol Meloidogyne incognita on Potato and Soil Microorganisms Diversity?
Mahmoud M.A. Youssef1, Wafaa M.A. El-Nagdi1*, Hassan Abd- El-Khair2, Usama S. Elkelany1, Mahfouz M.M. Abd-Elgawad1 and Mona G. Dawood3
ABSTRACT
Nature-friendly compounds are being explored to substitute chemically synthesized products for safe and effective control of crop pests. This study investigated the effects of Trichoderma viride (Tv) and T. virens (Tvr) as antifungal agents individually or combined with pomegranate peel aqueous extract (PP) on M. incognita infesting potato cv. Spunta. Based on the percentages juvenile reduction in soil at harvest time, the combined treatments of Tv or Tvr with PP recorded 66.8 or 60.5% nematode reductions, respectively, as each fungal agent was applied in soil before planting. However, such reductions were 83.7 and 78.7%, respectively, when Tv or Tvr were used as single treatments indicating more efficacy on M. incognita populations in the absence of PP. All treatments significantly (P ≤ 0.05) increased weights of plant branches and tubers; especially by individual than combined treatments. Biochemical compounds were influenced by different treatments of the tested materials. The diversity and community of aerobic bacteria, spore-forming bacteria and fungi and frequency% of fungi in potato rhizosphere varied among different treatments.
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