Enhancement of the activity of ferrugineol by N-pentanol in an attractant baited trap for the coconut pest, Rhynchophorus ferrugineus F. (Coleoptera: Curculionidae)

Abstract

Short chain alcohols, known attractants for the coconut pest, Rhynchophorus ferrugineus F.(Coleoptera: Curculionidae), were used to improve a 4-methyl-5-nonanol (ferrugineol) baited trap for the weevil. In a Y shaped olfactometer-choice test, 68% weevils selected the ferrugineol baited arm. n-Propanol and n-pentanol elicited responses in 80% and 79% respectively of weevils. Combinations of n-pentanol: ferrugineol (1:l) and n-propanol: ferrugineol (1:l) did not show increased activity (80% and 82% selection respectively). In a field assay, n-propanol and n-pentanol baited traps caught no weevils whereas ferrugineol caught a mean number of 0.42 weevils1 trap/ day. A 1:l combination of ferrugineol with five alcohols viz. n-propanol, n-butanol, n-pentanol, n-hexanol and n-nonanol were field tested as.baits for possible enhancement of activity of ferrugineol. A significantly higher catch of 0.85 weevils/ day/ trap, (p u 0.05, Scheffe's test) was obtained with ferrugineol:n-pentanol. Ferrugineol:hexanol baited traps caught 0.45 weevils/trap/day which was only marginally higher than that of the starjdard, ferrugineol. Other combinations caught fewer weevils (range 0.05-0.2 weevils/trap/day) and the control trap caught no weevils.

PHEROMONE BAITED TRAP FOR THE MANAGEMENT OF RED PALM WEEVIL, Rhynchophorus ferrugineus F. (Coleoptera: Curculionidae) POPULATION IN COCONUT PLANTATIONS

“…Ferrugineol was released from a capillary at a rate of 0.3-0.5 mg per day under laboratory conditions. N-pentanol, which was believed to be present in volatile compounds evolving from wounded coconut bark and proved to synergise the activity of ferrugineol (Gunawardena and Herath, 1995) was used as an additive in all traps. Two glass capillaries filled with 22 mg of each ferrugineol and pentanol were placed in a small plastic vial (4.5 cm x 1.5 cm) for use in the trap.…”

Synthesis of diastereomeric pheromones: adjacent methyl-branched alcohols and ketones

“…The absolute configuration of R. ferrugineus pheromone was known as (4S, 5S)-9a. However, attract effectiveness of both (4S,5S)-9a and racemic 9a was similar in trial programs to control the red palm weevil [5][6][7]. Moreover, racemic mixture of 9a was also used to manage populations of other species, R.…”

A facile synthesis of racemic aggregation pheromones of palm pests, Rhinoceros beetle and Rhynchophorus weevil

“…The effectiveness of both the (4S,5S) isomer of 2 and racemic 2 was shown by evaluation in traps, indicating them to be the most powerful attractants in operational programs to control the red weevil in palm plantations. [5][6][7][8] Therefore, effective and cost-efficient control of the insect populations is possible with pheromones and enhanced synthetic routes to these pheromones became an important goal. Thus the (R)-and (S)-isomers of 1 were prepared from the respective optical isomers of citronellol.…”