The effect of certaىn plant extracts on the development of the
root-knot nematode Meloidogyn incognita was studied under laboratory
and greenhouse conditions. Root extracts of acetone and petroleum ether
of american coneflower Echinacea angustifolia stimulated the egg
hatching of M. incognita at 200 and 400 p.p.m. The highest rate of
nematode reduction was obtained with high concentration of fenugreek
Trigoneilafenumgraecum and neem Azadirchata indica (acetone solvent
extract), where the percentage reductions were 75.48 and 66.73%;
respectively . The highest reduction in eggmasses, nematode final
population and gall formation was obtained with the dry powder of neem
followed by those of melia Melia azadrach, american coneflower and
fenugreek in adescending order. The plant growth of sunflower
Helianthus anuus was positively correlated with the increase of added
powders of all tested plants. Application of the moderate and high rate of
fenugreek improved the plant growth of sunflower plants. |
