ORIGINAL ARTICLE
The synergistic effect of piperonyl butoxide on the molluscicidal potential of monoterpenes and phenylpropenes against Theba pisana
| 1 | Department of Pesticide Chemistry and Technology, Faculty of Agriculture, 21545-El-Shatby, Alexandria University, Alexandria, Egypt |
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
CORRESPONDING AUTHOR
Samir Abdelgaleil
Department of Pesticide Chemistry and Technology, Faculty of Agriculture, 21545-El-Shatby, Alexandria University, Alexandria, Egypt
Department of Pesticide Chemistry and Technology, Faculty of Agriculture, 21545-El-Shatby, Alexandria University, Alexandria, Egypt
Submission date: 2018-05-07
Acceptance date: 2018-11-23
Online publication date: 2018-12-13
Journal of Plant Protection Research 2018;58(4):381–386
KEYWORDS
TOPICS
ABSTRACT
The molluscicidal activity of six monoterpenes and two phenylpropenes against Theba
pisana adults was evaluated using fumigation and direct contact methods. In the fumigant
toxicity assay, (-)-citronellal showed the highest toxicity with LC50 value of 7.79 μl · l−1 air
after 24 h of treatment, followed by (-)-terpinen-4-ol (LC50 = 12.06 μl · l−1), (-)-menthone
(LC50 = 12.28 μl · l−1 air) and p-cymene (LC50 = 16.07 μl · l−1 air). Eugenol and trans-cinnamaldehyde
were the most potent contact toxicants against T. pisana. Their LD50 values
were 0.18 and 0.29 mg · snail−1 after 24 h of treatment, respectively. These two compounds
were more toxic than a reference molluscicide, methomyl. In contrast, α-terpinene and
(-)-citronellal were the least toxic compounds. In another experiment, the synergistic effect
of piperonyl butoxide (PBO) on tested monoterpenes and phenylpropenes by topical application
was examined. The results showed that the toxicity of the tested compounds was
increased when mixed with PBO at a ratio [compound/PBO (1 : 2)] except for α-pinene
and (-)-terpinen-4-ol in which the toxicity of binary mixtures was less than for single compounds.
The synergistic effect of PBO improved with increased exposure time. The highest
synergistic effect was observed with (-)-menthone and α-terpinene with synergistic ratios
of 9.25 and 4.37, respectively. Monoterpenes and phenylpropenes and their mixtures with
PBO described herein merit further studies as potential T. pisana control agents.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
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