Abstract
Cotton leaf spot (Alternaria macrospora) is a widespread disease that occurs in the main cotton-producing area of China. In managing this disease, a novel chitosan-based biopesticide, an amphiphilic N-alkyl-O-carboxymethyl chitosan derivative, was prepared. The product was selected from variations of chitosan with different molecular structures, which were obtained via a two-step reaction. First, carboxymethyl chitosans with varying molecular sizes were obtained by etherification with chloroacetic acid; then the carboxymethyl chitosan was alkylated with C4–C12 fatty aldehyde through a Schiff-base reaction. This procedure resulted in derivatives of amphiphilic N-alkyl-O-carboxymethyl chitosan, which showed strong antifungal activities against A. macrospora, and the efficacy was determined by its molecular structure.
Highlights
Cotton leaf spot (Alternaria macrospora) is a widespread disease [1], which occurs in main cotton-producing area of China, in the Northern area
Some synthetic chemical fungicides have been effective for years until they were overcome by the pathogen
The carboxymethyl derivatives of the chitosan samples with various molecular weights were synthesized by etherification with chloroacetic acid under mild basic condition (Figure 3) Fourier transform infrared (FTIR) spectra of the carboxymethyl chitosan (CCS) sample, in which CCS had absorptions at
Summary
Cotton leaf spot (Alternaria macrospora) is a widespread disease [1], which occurs in main cotton-producing area of China, in the Northern area. The disease is more severe in damp and rainy years [1]. Several strategies have been used, including chemicals. Some synthetic chemical fungicides have been effective for years until they were overcome by the pathogen. Their applications have caused environmental pollution [2]. There is a need to develop novel strategies that are environment friendly for disease control [3]
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