Comparison of Cassava Varieties on Infection of Root-knot Nematode, <I>Meloidogyne incognita</I> (Kofoid and White) Chitwood and Efficiency of Commercial Products of Antagonistic Fungi for Controlling
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Abstract
Ten well-known varieties of cassava; (Rayong 5, 7, 9, 11, 13, 72 and 90, KU 50, Huay Bong 60 and 80) were tested on root-knot nematode Meloidogyne incognita (RKN) infection in greenhouse condition. The cassava plant was grown in the pot (Ø 15 cm), until 21 days after planting, the nematode egg suspension (3,000 eggs) was infested in the pot per plant. After 45 days of inoculation, the quantitative nematode parameters (number of gall/root system, number of eggs/g root, and number of female adults/g root) and also growth parameters, (shoot height, shoot and root fresh weight and root fresh weight), were evaluated. The result showed that Rayong 9 was the most susceptible variety to RKN. For the efficiency of 4 commercial products of antagonistic fungi (Beauveria bassiana, Paecilomyces lilacinus, Metarhizium anisopliae and Trichoderma harzianum) on control RKN of cassava variety Rayong 9 was investigated under greenhouse condition in comparison to using nematicide (carbosulfan) and control 1 (no use of the products or nematicide and inoculation with RKN egg suspension) and untreated cassava (control 2). The commercial products were applied using recommendation rates to the cassava plants in pots. After 7, 5, 3 and 0 days of fungal application, the RKN egg suspension was inoculated in the soil. The experiments were carried out in a greenhouse comprised 19 treatments, 4 replications in CRD. After 45 days of RKN inoculation, cassava plants were determined and evaluated on RKN and growth parameters. The result of the experiment (March 16th - May 1st, 2018) demonstrated that the 4 antagonistic products and carbosulfan were (P<0.05) effective on control RKN showing 60.35 - 276.80 egg masses/root system with gall reduction of 60.28 - 91.34% and better than control treatment (696.96 egg masses), even though on the application of 7, 5, 3 or 0 day before RKN inoculation. Especially, using T. harzianum at 7 days before RKN inoculation, gave rise to the lowest number of RKN parameters, compared to other treatments treated with RKN and showing the most reduction of gall 91.34%.
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References
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