Herbivore-induced wheat volatiles facilitate biocontrol of the cereal aphid by the multicolored Asian ladybeetle

doi:10.7679/j.issn.2095-1353.2020.01.021

Abstract

Abstract:

[Objectives] To determine if herbivore-induced plant volatiles can enhance the biocontrol of the cereal aphid (Sitobion avenae) in wheat fields by attracting their natural enemy, the multicolored Asian ladybeetle (Harmonia axyridis). [Methods] The olfactory responses of adult Asian ladybeetles to undamaged wheat seedlings, wheat seedlings that had been fed on by cereal aphids and to synthetic (cis)-3-hexenyl acetate, were measured and compared. In addition, the effect of applying (cis)-3-hexenyl acetate to wheat fields on both ladybeetle and cereal aphid populations was investigated. [Results] The emission rate and relative content of (cis)-3-hexenyl acetate emitted by wheat seedlings increased after these had been fed on by cereal aphids. Both wheat seedlings that had been fed on by cereal aphids and (cis)-3-hexenyl acetate were strongly attractive to adult ladybeetles. Applying (cis)-3-hexenyl acetate to wheat fields attracted ladybeetles and decreased wheat aphid abundance. [Conclusion] The herbivore-induced plant volatile, (cis)-3-hexenyl acetate, has the potential to attract the multicolored Asian ladybeetle, thereby enhancing the biocontrol of cereal aphids in wheat fields.

Key words: (cis)-3-hexenyl acetate, ladybeetle, attractant, conservation biological control

Fei QIAO, Zhi-Ping CAI, Jian-Wei SU. Herbivore-induced wheat volatiles facilitate biocontrol of the cereal aphid by the multicolored Asian ladybeetle[J]. Chinese Journal of Applied Entomology, 2020, 57(1): 189-195.

Figures/Tables 4

References 18

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		蚜虫密度 Density of cereal aphid		异色瓢虫密度 Density of beetle
		预测值±标准误 Est. ± SE.	P	预测值±标准误 Est. ± SE.	P
处理前 Before application	截距Intercept	4.62 ± 0.05	<0.001	-1.31 ± 0.69	0.056
	小区Plot	0.45 ± 0.01	<0.001	0.38 ± 0.19	0.045
	处理Treatment	0.03 ± 0.02	0.226	0.56 ± 0.31	0.074
处理后一周 One week after application	截距Intercept	5.15 ± 0.11	<0.001	-2.46 ± 0.44	<0.001
	小区Plot	-0.31 ± 0.04	<0.001	0.92 ± 0.11	<0.001
	处理Treatment	-0.63 ± 0.06	<0.001	1.29 ± 0.18	<0.001
处理后两周 Two weeks after application	截距Intercept	-34.00 ± 3 572.00	0.993	0.03 ± 0.38	0.938
	小区Plot	-3.66 ± 0.99	<0.001	0.40 ± 0.11	<0.001
	处理Treatment	19.00 ± 1 786.00	0.991	0.39 ± 0.18	0.026

		蚜虫密度 Density of cereal aphid		异色瓢虫密度 Density of beetle
		预测值±标准误 Est. ± SE.	P	预测值±标准误 Est. ± SE.	P
处理前 Before application	截距Intercept	4.62 ± 0.05	<0.001	-1.31 ± 0.69	0.056
	小区Plot	0.45 ± 0.01	<0.001	0.38 ± 0.19	0.045
	处理Treatment	0.03 ± 0.02	0.226	0.56 ± 0.31	0.074
处理后一周 One week after application	截距Intercept	5.15 ± 0.11	<0.001	-2.46 ± 0.44	<0.001
	小区Plot	-0.31 ± 0.04	<0.001	0.92 ± 0.11	<0.001
	处理Treatment	-0.63 ± 0.06	<0.001	1.29 ± 0.18	<0.001
处理后两周 Two weeks after application	截距Intercept	-34.00 ± 3 572.00	0.993	0.03 ± 0.38	0.938
	小区Plot	-3.66 ± 0.99	<0.001	0.40 ± 0.11	<0.001
	处理Treatment	19.00 ± 1 786.00	0.991	0.39 ± 0.18	0.026