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PRELIMINARY INVESTIGATION ON INSECTICIDAL ACTIVITY OF Ajuga nipponensis

Hen R, Hao Shen

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Abstract

This paper reports the extraction and preliminary isolation of the air part of Ajuga nipponensis.It has been found out that the chloroform extract C in these fractions has the strongest antifeeding activity to Pieris ropae.At a concentration of 0.5%,the antifeeding ratio is 78.9%,and median antifeeding concentration(AFC_(50))is 0.121%.In the toxicity tests,it is found that the extract C exhibits very strong inhibitory activity of growing and developing of Pieris rapae and Plutella xylostella.At the concentrations of 0.2% and 0.5%,the effects are 70% and 80%,respectively.And the median effective dose(ED_(50))is 0.335 mg/g insect.Especially,the toxicity of the extract C to two resistant strains of Plutella xylostella shows no evident difference and no mutual resistance with Cypermethrin and Acephate.In preliminary field trials,it is found that there is a certain effect.

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What this paper is about

This paper reports the extraction and preliminary isolation of the air part of Ajuga nipponensis.It has been found out that the chloroform extract C in these fractions has the strongest antifeeding activity to Pieris ropae.At a concentration of 0.5%,the antifeeding ratio is 78.9%,and median antifeeding concentration(AFC_(50))is 0.121%.In the toxicity tests,it is found that the extract C exhibits very strong inhibitory activity of growing and developing of Pieris rapae and Plutella xylostella.At the concentrations of 0.2% and 0.5%,the effects are 70% and 80%,respectively.And the median effective dose(ED_(50))is 0.335 mg/g insect.Especially,the toxicity of the extract C to two resistant strains of Plutella xylostella shows no evident difference and no mutual resistance with Cypermethrin and Acephate.In preliminary field trials,it is found that there is a certain effect.

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Available abstract

This paper reports the extraction and preliminary isolation of the air part of Ajuga nipponensis.It has been found out that the chloroform extract C in these fractions has the strongest antifeeding activity to Pieris ropae.At a concentration of 0.5%,the antifeeding ratio is 78.9%,and median antifeeding concentration(AFC_(50))is 0.121%.In the toxicity tests,it is found that the extract C exhibits very strong inhibitory activity of growing and developing of Pieris rapae and Plutella xylostella.At the concentrations of 0.2% and 0.5%,the effects are 70% and 80%,respectively.And the median effective dose(ED_(50))is 0.335 mg/g insect.Especially,the toxicity of the extract C to two resistant strains of Plutella xylostella shows no evident difference and no mutual resistance with Cypermethrin and Acephate.In preliminary field trials,it is found that there is a certain effect.

Key concepts: Plutella, Pieris rapae, Cypermethrin, Toxicity, Toxicology, Acephate, Biology, Pieris brassicae

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