Effects of Cyanobacteria Nostoc calcicola extract on lifetime and fecundity of cowpea aphid (Aphis craccivora Koch)

Mai Van Chung  and Do Ngoc Dai
Faculty of Biology, Vinh University, Le Duan str. 182, Vinh city, Nghe An province, Viet Nam
Faculty of Agro-Forestry-Fish culture, Nghe An College of Economics, Ly Tu Trong str. 51, Vinh city, Nghe An province, Viet Nam
*Corresponding author: chungmv@vinhuni.edu.vn

  Abstract
The main objective of this work was to study the influences of strain Nostoc calcicola HN9 seperately collected in log phase and death phase on lifetime and fecundity of cowpea aphid (Aphis craccivora Koch) rearing on soybean plant [Glycine max (L.) Merr.]. Except for extract of 0.01% N. calcicola in log phase, others formulae of cyanobacterial concentrations significantly reduced the quality of reproduction and shortened lifetime of A. craccivora. N. calcicola extract was likely to affect directly to herbivores via the bioactive substances that repel cowpea aphid through toxicity or by reducing infestation. Parallel the extract also stimulated plant growth, raised quality of the physiological processes, therefore, indirectly improved the soybean defensive mechanisms against cowpea aphid.

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