การทดสอบความชอบในการเข้าทำลายของด้วงงวงมันเทศ (Cylas formicarius F.) บนมันเทศพันธุ์ต่างๆ

Abstract

Damaging observation in term of preference of sweet potato weevil (Cylas formicarius F.) on 219 varieties of sweet potato was conducted at Pijit Agricultural Research and Development Center, Pijit province, as well as laboratory preference test using no choice method, the relationship among infestation level, sweet potato color, %dried weight latex, %dried weight tube and containing of phenolic compound were also conducted. The result showed that, the sweet potato weevil infested various colors of sweet potatoes with non-statistically significant differences at 95%. Out of 14 varieties were infested with low level, less than 37.5%, such as Edok, Triyoke, Pakan-2, Khai Trad, Khai Nakorn-2, Kanlasin, Lheungbanlung, Khai Chaingmai, Banyang, Banyang-9, S0183, CIP-35-5, BB95040-16 and CIP-14-1. The infestation levels were of negative correlation with %dried weight latex and %dried weight tube with the statistically significant difference at 95% as well as were of negative correlation with phenolic compound with the statistically significant difference at 99% which showed the correlation coefficients, r = -0.55, -0.60 and -0.83, respectively. The obtained study provided important information in order to improve resistant sweet potato variety against the weevil.