Effect of aqueous extracts of plant products on hatching and penetration of Meloidogyne incognita infecting sunflower

The aqueous extracts of fresh leaves of neem (Azadirachta indica), ak (Calotropis procera) and dek (Melia azedarach); and oilcakes of mustard and cotton were tested on hatching and penetration of root knot nematode, Meloidogyne incognita on sunflower plants. The maximum inhibition of hatching occurred at N and N:10 concentration of aqueous extracts of all the plant products. Cotton cake was best in causing maximum inhibition. Penetration by the second stage juveniles into the roots of sunflower plant was significantly inhibited by all the plant products over control. However, highest doses i.e. 20 and 40g/kg soil were better in suppressing penetraion. Cotton cake caused maximum suppression in the penetration.