Journal
EGYPTIAN JOURNAL OF BIOLOGICAL PEST CONTROL
Volume 31, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1186/s41938-021-00437-y
Keywords
Citrus foot rot; gummosis; Kinnow; Phytophthora nicotianae var; parasitica; T20 mutant Trichoderma asperellum
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Funding
- Department of Plant Pathology, PAU, Ludhiana
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The study found that the talc-based bioformulation of T. asperellum T20 mutant strain, used as a soil treatment, was able to effectively manage foot rot/gummosis of citrus and also exhibited the highest yield.
Background Foot rot/gummosis of citrus, caused by Phytophthora spp., is the most important disease of citrus, responsible for the yield losses of 10 to 30% in fruit production in major citrus growing countries. Considering the burden of disease, the present study was undertaken to evaluate different native potent strains of Trichoderma spp. against the foot rot/gummosis of citrus. Results Based on molecular characteristics, i.e., ITS ribosomal DNA sequence analysis, 3 isolates of Phytophthora nicotianae var. parasitica and 7 isolates of Trichoderma (6 isolates of T. asperellum and one of T. harzianum) were identified. Trichoderma isolates and Metalaxyl-M + Mancozeb were used to assess antagonistic activity against the foot rot/gummosis under field conditions. T. asperellum T20 mutant reduced gummosis lesion size (95.67%), improved feeder root density (0.0236 cm(3)), increased number (990.16), and yield of fruits (168.83 kg). Conclusions The talc-based bioformulation of T20 mutant (T. asperellum) strain, used as a soil treatment, was able to manage effectively the gummosis/foot rot of citrus and also exhibited the highest yield.
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