Comparison of two types of aggregation pheromone dispensers for trapping Frankliniella occidentalis (Thysanoptera: Thripidae)
Author of the article:SUN Ran-Ran；LI Xiao-Wei；ZHANG Jin-Ming；ZHANG Zhi-Jun；ZHANG Li-Meng； Lü Yao-Bin
Author's Workplace：Department of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China; Yuxi Tobacco Company, Yuxi 653100, China; Engineering Center for Biological Control for Diseases and Pests in Tobacco Industry, Yuxi 653100, China
Key Words：aggregation pheromone; rubber septa; PVC hollow fibers; release pattern; trap catches
Abstract：
[Objectives] To compare the
performance of two types of pheromone dispensers for releasing two aggregation
pheromones of Frankliniella occidentalis [neryl (S)-2-methylbutanoate
and (R)-lavandulyl acetate] and
thereby inform the choice of pheromones and pheromone dispensers for
controlling these pests. [Methods] The
release profiles of the 2 active compounds from pheromone dispensers with a rubber septum or hollow PVC fibers were compared
in a laboratory over a 7-day period using with solid phase microextraction
(SPME) and a gas chromatography-mass spectrometer (GC-MS). In addition, the effect of time on the release ratios of N(S)2MB to (R)-LA was investigated to determine the optimal blend of these two
compounds in both types of dispenser. The trapping efficacy of both
types of dispenser baited with an optimal blend of aggregation pheromone
compounds was then compared in field trials. [Results] The laboratory experiments show
that the amount of neryl (S)-2-methylbutanoate
and (R)-lavandulyl acetate released
from the two different types of dispenser were markedly different. Over the
7-day experimental period dispensers with a rubber septa released more neryl (S)-2- methylbutanoate, and less (R)-lavandulyl acetate, than those with
hollow PVC fibers. In addition, dispensers with rubber septa loaded with a
ratio of 8︰1 neryl (S)-2-methylbutanoate
to (R)-lavandulyl acetate released
these pheremones at a ratio ranged from 5.84 to 19.24, which is within the
natural range of F. occidentalis.
Dispensers with PVC hollow fibers had a relatively stable release ratio of
about 4. Furthermore, field trials indicate that dispensers with rubber septa performed better than those with hollow PVC
fibers with respect to trapping F.
occidentalis adults. [Conclusion] These results suggest that dispensers with rubber septa are
superior to those with hollow PVC fibres for dispensing the aggregation
pheromones of F. occidentalis.
However, hollow PVC fibers can also perform well if the ratio of pheromones is
optimized when the dispenser is loaded.