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Journal of Bioactive and Compatible Polymers
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Insecticidal and Fungicidal Activities of Chitosan and Oligo-chitosan

Mi Zhang

Tianwei Tan

Department of Biochemical Engineering Beijing University of Chemical Technology Beijing 100029, Chinatantw{at}mail.buct.edu.cn

Huizhu Yuan

Changhui Rui

Institute of Plant Protection Chinese Academy of Agricultural Sciences Beijing 100094, China

The activity of chitosan and oligo-chitosan on several plant insects and pathogens were studied. Chitosan was active against lepidopterous and homopterous insects; the mortality was 80%. The insecticidal activity of chitosan to Plutella xylostella L. was higher than that to Spodoptera exigua Hübner. The mortality of six types of aphids was generally 60–80%, and the highest was 99.7%. Some fungicidal activity by oligo-chitosan was observed on 12 plant pathogens. The inhibition effect of oligo-chitosan to plant pathogens was improved with increasing oligomer concentration. The highest inhibition rate (80%) was against Phomopsis asparagi (sacc.a) Bubak (95%) and the inhibition rate against Fusarium oxysporum (Schl.) f. sp. Cucumernum owen, Rhizoctonia solani Kuhn and Fusarium oxysporum Schl. F. Sp. Uasinfectum (Atk.) Snyd. & Hans.

Key Words: chitosan • oligo-chitosan • insecticidal activity • fungicidal activity • pathogens • oligomer

Journal of Bioactive and Compatible Polymers, Vol. 18, No. 5, 391-400 (2003)
DOI: 10.1177/0883911503039019
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