Rok khua phon nao khong phon mamuang phailang kan kepkieo thi koet chak chuara Botryodiplodia theobromae Pat. lae kan khuapkhum.
1989
Saipin Juntap
Infection process of Botryodiplodia theobromae Pat. It infected through stem end and penetrated to the depth of 2-3 mm within 24-48 hrs after inoculation. After 72 hours, the mycelium could penetrate to the depth of 1 cm. B. theobromae Pat. could infect mango both at stem end and at the other wounded areas of the fruits without any difference in disease severity. The disease incidence on the fruit which were inoculated and incubated for 6, 9 and 12 hours was more severe than 3 hours of inoculation. There was no significant difference of disease severity between fruits inoculated for 9 and 12 hours. Pathogenicity test amoung isolates of B. theobromae Pat. obtained from diseased mango fruit, dry twig on plant, dry twig on ground, diseased guava, rumbutan, passion fruit, banana, rose apple fruit and soil showed that isolates from diseased mango fruits, branch and stem of healthy mango tree and diseased guava fruit were more virulent than isolates from diseased banana, passion fruit and rambutan fruit. The less severity isolates were from diseased rose apple fruits and the soil. Dipping the fruit in hot water at 52 deg C mixed with benomyl, imazalil and myclobutanil at 500 ppm for 5 minutes gave a good control. It should be applied within 6 hours after inoculation. The fungicide suspension should also be used within 4 hours after its preparation. The treatment with myclobutanil 500 ppm at room temperature (29-30 deg C) for 5 minutes was also effective but benomyl and imazalil 500 ppm at room temperature for 5 minutes were less effective.
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