hitosan (poly-N-acetylglucosamine) is a natural and biodegradable biopolymer. Chitosan and its derivatives can be variously used as a permeability control agent and an antimicrobial compound. So, addition of three molecular weights of fungal chitosan (1.9x10 5 ; 1.4x10 5 and 2.1x10 4 Da) at soil as well as castor oil and Nemacur 10% G (chemical control) significantly reduced (p≤0.05) root-knot nematode infection caused by Meloidogyne incognita and improved growth of banana plants cv. Williams as compared with the control. Fungal chitosan type at Mw (2.1x10 4 Da) gave the most effective results in reducing the number of galls and the final population of nematode. On the other hand, fungal chitosan type at Mw (1.9x10 5 Da) surpassed the other tested materials and showed relatively maximum growth parameters as compared with the other treatments and the check.

Nowadays, the successful management of potato late blight disease underEgyptian conditions requires evaluating the effectiveness of fungicides continuously. A total of 419 isolates of Phytophthora infestans were isolated during three growing seasons in Egypt. Under laboratory conditions, all active ingredients treatments significantly reduced the mycelium growth compared to the untreated control plates. Cymoxanil and Dimethomorph have the highest effect on the mycelium growth reduction. Results obtained from the field experiment showed that fungicides contain mixtures of active ingredients were superior in their effect than other fungicides which contain only one active ingredient. In addition, fungicides contain mixture of contact with trans-laminar active ingredients reduced potato late blight incidence more than contact fungicide with one active ingredient. Triomax has the highest effect on foliar blight reduction.

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White mold disease of pepper that cause about Sclerotinia sclerotiorum, is considered one of the most important disease which infected pepper. The disease symptoms were beginning with dark-green, water-soaked lesions on stems and fruits. Lesions expand rapidly under most conditions, and the affected parts become a watery rotten mass covered by white fungal growth. After several days, the fungal growth on external plant surfaces plant forms a white. Which develops a black exterior and white to beige interior several days later moldy growth and black sclerotia are characteristic of this disease, that cause also to a very loose in the crop. Efficacy of application of some agricultural practices, i.e. plant density, breeding of seedlings, irrigation, fertigation and transplanting date on control of white mold disease that caused by Sclerotinia sclerotiorum was examined under greenhouse conditions during summer seasons (2016/2017) in Belco EgyptCo. Farm Sadat city, Menoufia governorae. Three distances between the transplants were investigated, in addition to, two methods were used in the breeding of pepper plants (Orngery RZ F1 hybrid), three differnt levels of irrigation, three levels of fertigation, plant density and three transplanting date were also studied.