Abstract
A study was conducted to determine the role of the earhead bug (Leptocorisa acuta Thumb. [Heteroptera: Alydidae]) in the manifestation of sheath rot disease caused bySarocladium oryzae (Sawada) W. Gams & D. Hawksw. [syn.Acrocylindrium oryzae (Sawada)], with the aim of formulating effective control measures against the disease. In greenhouse studies, rice plants (Oryza sativa, cv. IR 20) exhibited typical sheath rot within 12 days whenS. oryzae spore suspensions (5 x 107 conidia/ml) were sprayed on earhead bug-infested plants (5 bugs/tiller). In a comparison of various inoculation methods, swabbing a spore suspension (using a camelľs hair brash) on the sheath surface of earhead bug-infested plants, and inserting a single-grain culture inside the sheath of infested plants, produced the greatest disease severity within 18 days of inoculation. The results demonstrated (a) the role of the earhead bug in sheath rot disease manifestation and (b) that rice genotypes can be screened effectively and rapidly in the greenhouse for resistance to the disease, using the described inoculation techniques.
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Lakshmanan, P., Kumar, S.M. & Velusamy, R. Role of earhead bug (leptocorisa acuta) feeding on sheath rot disease caused bysarocladium oryzae inoryza sativa in India. Phytoparasitica 20, 107–112 (1992). https://doi.org/10.1007/BF02981276
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DOI: https://doi.org/10.1007/BF02981276