Mass trapping of the diamondback moth (<i>Plutella xylostella</i> L.) by a combination of its sex pheromone and allyl isothiocyanate in cabbage fields in southern Vietnam

• DOI: 10.1584/jpestics.d23-042
• Publication Date: 2024-02-20T22:11:40Z
• Authors: Dinh Thi Chi; Ho Le Thi; Le Van Vang; Tran Thanh Thy; Masanobu Yamamoto; Tetsu Ando

A lure composed of (Z)-11-hexadecenal, (Z)-11-hexadecenyl acetate, and (Z)-11-hexadecen-1-ol at a ratio of 5 : 5 : 1 at a dose of 0.01 mg was optimal for the attraction of the Vietnamese strain of the diamondback moth (DBM). The combination of the sex pheromone with a plant volatile, allyl isothiocyanate, significantly increased the attraction of the pheromone trap. Females were also attracted, but they were only about 2% of all moths captured. In plots with 120-130 traps per ha, mass trapping with the combined lures reduced the DBM larval densities in cabbage fields as effectively as the spraying of insecticides 6 to 8 times. The weekly trap catches indicated that DBM adult densities in the mass-trapping fields were low until 28 days after transplantation, and then were kept to a modest increase until day 49. This field study also shows that the trap catches were well correlated with the DBM larval densities.