فعالية الكايتوسان في استحثاث مقاومة جهازية مكتسبة ضد الإصابة بنيماتودا تعقد الجذور Meloidogyne javanica (Treub)‎ Chitwood على الطماطم-البندورة

الملخص EN

Treatment with chitosan potentially induced systemic acquired resistance in tomato plants against the infection of Meloidogyne javanica.

The level of induced resistance depended on concentration and method of application.

In greenhouse experiments, soaking tomato seeds or dipping the roots for 20 min in a solution of 1.5 mg/ml chitosan was the most effective as compared to other concentrations and exposure periods.

Under field conditions, plants of soaked seeds with 1-3 chitosan (1.5 mg/ml) sprays induced significant reduction in nematode infection parameters which included number of larvae/ 250 gm soil and number of larvae, females and eggs/10 g roots and the root galling index.

In seed treatment and double sprays with chitosan, at inoculation and flowering time, the infection parameters were 510, 148, 44, 225 and 48% as compared to control treatment 2813, 980, 152, 1728 and 83%, respectively.

The use of a third spray at fruit setting did not increase nematode resistance.