Biology and distribution of Palembus dermestoides (Fairmaire) (Tenebrionidae: Coleoptera) and its susceptibility to insecticides [Philippines]
1989
Yumol, R.D.
The biology of "Korean bug" P.[Palembus] dermestoides (Fairmaire) was studied under laboratory conditions. The total life cycle on banana chips ranges from 53 to 94 days. The egg hatches in 3 to 4 days at 29 degree C room temperature. The beetle passes through ten larval instars with a total developmental period of 43 to 74 days. Pupal and preoviposition periods ranges from 4 to 11 and 5 to 9 days, respectively. Oviposition period is from 87-120 days. Sex ratio of the female to the male is 2.2: 1.8. The development from egg to adult stages, oviposition period, fecundity, and longevity of P. dermestoides are significantly affected by the different food media. Development is shortest on wheat flour and longest on cassava flour with a mean of 33.43 and 68.68 days, respectively. The survey conducted on P. dermestoides showed higher incidence in Jolo Sulu, Basilan Island and Zamboanga [Philippines]. The beetle was also noted in Los Banos, Calauan and San Pablo City in Laguna [Philippines]. No P. dermestoides were observed in Dumaguete City and Santa Catalina, Negros Oriental and Puerto Princesa, Palawan [Philippines]. Collections, however, were taken from private cultures. The contact toxicities of chlorpyrifos, carbaryl and fenvalerate were determined on P. dermestoides and compared with that of malathion. The LD99 is calculated and determined to serve as a basis for monitoring insects resistance to insecticides. Although malathion is observed to be more toxic than fenvalerate after 24 hours, the reverse is true 48 and 72 hours after treatment.
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