التفاعل بين نيماتودا الحوصلات Heterodera latipons Franklin و فطر عفن الجذور Cochliobolus sativus (Ito and Kurib.)‎ Drechs. ex Dastur على نباتات القمح

Abstract EN

A laboratory experiment was carried out to study the interaction of the cyst nematode Heterodera latipons and the root rot fungus, Cochliobolussativus, onWheat cv.

Sham3.

Six treatments were examined to determine their effects on the growthandproductivityofthe wheat cultivar, and on the infectivity of the root rot fungus and cyst nematode.

These treatments were: non-inoculated check, nematode inoculation, fungusinoculation,nematodeplus fungus inoculationat planting,fungus then nematode inoculation one monthlater,and nematodefollowed by fungus inoculation one month later.

Results showed that each of the nematode and the fungus inoculations as well as nematode followed by fungus inoculation one month later have greatly suppressed (P< 0.05) total plant weight, root weight and number of spikes/plant.

However, weight of 1000 wheat kernels was greatly suppressed(P<0.05) by the treatments where nematode alone,nematode plus fungusatplanting, and nematode then fungus one month later were applied.

Nematode reproduction reached its maximum in the treatment of nematode alone inoculation, and gradually decreased by the treatments of the nematode plus fungus combinations until it reached its lowest value in the treatmentwhereplantswereinoculatedwith nematodes followed by fungus one month later.On the other hand,percentage of C.

sativusroot rot infection was only suppressed (P<0.05)in the treatment where plants were inoculated with the fungus followed by nematode one month later.

Key words: Cochliobolus sativus, Heterodera latipons, interaction, wheat