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Biological and ecological studies of the greater coconut spike moth (Tirathaba rufivena Walker) and its natural enemies.  [1989]

Gallego M.C.E. Philippines Univ., Los Banos, College, Laguna (Philippines). [Corporate Author]

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Abstract
The coconut spike moth (Tirathaba rufivena) was found to be widely distributed throughout the coconut growing areas in the country. It was more prevalent on newly fruit-bearing palms. The total developmental period of T. rufivena was 30.00 days. The average incubation, larval, pre-pupal, and pupal periods were 5.77, 14.15, 3.06, and 6.55 days, respectively. The larva underwent six instars. The average adult longevity was 6.33 days. The average number of eggs laid per female was 170.45 with an average daily rate of 42.61 and percent hatchability of 83.84. Three natural enemies were observed to parasitize T. rufivena Walker, namely: Telenomus tirathabae Wilk., Apanteles tirathabae Wilk., and Ventularia palmaris Wilk. An earwig was also suspected as a predator of the pest. The Apanteles tirathabae can easily be reared on 2-or 3-day old host larvae under laboratory conditions. Adult longevity was prolonged by feeding pure honey and sugar solutions (10 to 50%). The total population of the coconut spike moth and its parasitoid was higher on constricted inflorescences than on loosely opened inflorescences, with a mean of 37.20 and 24.97, respectively. Preference of T. rufivena was observed on 8 coconut varieties. GDH x Wat was preferred most, followed by YMD x Wat, RMD x Wat, RCD x Wat, Tacunan, CAT x BAO, TAC x BAO and Laguna, with the following percentage infestations: 32.97, 29.36, 22.53, 21.14, 12.68, 12.12, 11.17, and 9.10, respectively. Removal of spathe sh
eaths of coconut flowers controlled the infestation of T. rufivena as shown by a high nut harvest of 12.93 percent compared to flowers with spathe sheaths intact having only 6.11 percent nut harvest. Application of pirimiphos-methyl (PM) insecticide provided no significant effect on yield compared with the control. Forty percent button thinning (a simulated Tirathaba damage) did not significantly affect yield compared to the control.
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Other subjects

  • enemigos naturales
  • ennemi naturel
  • lepidoptera
  • etapas del desarrollo animal
  • stade de developpement animal
  • animal developmental stages
  • insecte nuisible
  • natural enemies
  • insectos daninos
  • noix de coco
  • coco
  • coconuts
  • pest insects

Other information

Language : English

Type : Journal Article

In AGRIS since : 2012

All titles :

" Biological and ecological studies of the greater coconut spike moth (Tirathaba rufivena Walker) and its natural enemies. "