Effect of volatile fatty acids on embryogenesis and hatching of Meloidogyne incognita eggs


  • R. K. Bansal
  • Amit Bajaj


Meloidogyne incognita egg masses were immersed in different concentrations of six volatile fatty acids to bioassay their toxic effect on embryonic development and hatching. Exposure to a 250 ppm aqueous solution of volatile fatty' acids completely suppressed egg hatching within 48 hours. When exposed to a 125 ppm concentration hatching was reduced 75 % by acetic acid, 91 % by propionic acid, 23 % by butyric acid, 63 % by isobutyric acid, 41 % by valeric acid and 69 % by caprylic acid during 12 days of incubation. In revival studies hatching did not resume in acetic and caprylic acid-treated eggs even after rinsing in water, whereas it resumed in isobutyric and propionic acid treated eggs. Valeric acid delayed hatching. Results indicated th~t acetic and caprylic acids reduced hatching most effectively and irreversibly by impairing embryogenesis at 'static-vermiform' and 'gastrula' stages respectively.