ราสาเหตุโรคผลเน่าของเงาะ (Nephelium lappaceum L.) และการควบคุมโรคโดยใช้กรดซาลิไซลิก
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Abstract
Rambutan is a short storage period fruit and often rot damage of fresh fruits are infected by several species of fungi after harvested. This study aimed to investigate the fungal agents of rambutan fruit rot and to evaluate the efficiency of salicylic acid on controlling the disease. Rambutan fruits cv. Rongrein were obtained from eastern growing area, i.e. Rayong, Chanthaburi and Trat provinces. The results revealed that the most commonly detected fungi in decayed fruits were Gliocephalotrichum spp. (68.8 %), Pestalotiopsis spp. (62.8 %) and Lasmenia spp. (53.0 %), respectively. For pathogenicity test, Gliocephalotrichum LKS-GB3 was the most virulent. The optimum concentration of salicylic acid at 1 mM was selected for controlling the disease due to this concentration could delay disease incidence by natural infection when compared with other concentrations. It also displayed inhibitory effects on diseased fruit inoculated by Gliocephalotrichum LKS-GB3 and Lasmenia TKS-1. Salicylic acid at 1 mM had higher efficiency on reducing disease incidence of the fruit inoculated by Gliocephalotrichum than those of the fruit inoculated by Lasmenia, as 30.3 and 13.3 %, respectively. Additionally, it had similar effect on decreasing disease severity on both of inoculated fruits, as 20 and 27.1 %, respectively. The mechanism of salicylic acid on controlling the disease will be discussed.
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References
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