Occurrence of Pythium rot of Chinese cabbage in Egypt and its biocontrol measures

• Autorzy: El-Mohamedy R S R , El-Mougy N.S.

Warianty tytułu

PL

Wystepowanie zgnilizny kapusty chinskiej wywolywanej przez Pythium w Egipcie i sposoby jej zwalczania

• Języki publikacji: EN

Abstrakty

EN

In Egypt, Chinese cabbage Brassica rapa var. pekinensis is a recently introduced as a winter crop grown throughout the country along the Nile valley as well as in new reclaimed lands. Pythium rot of Chinese cabbage was detected during the cultivation season 2005/2006 at four governorates throughout the north side of Egypt. Isolation trails revealed that Pythium ultimum was the causal organism of disease incidence. The cultivar of Chinese cabbage Napa (green) showed higher susceptibility to infection than Michihli cv. (red). Trichoderma harzianum, T. viride, Bacillus subtilis and Pseudomonas fluorescens isolated from the rhizosphere of healthy Chinese cabbage could inhibit the in vitro growth of P. ultimum at different degrees. Under greenhouse and field trails, applying of biocontrol agents as a combination of soil mixing plus root dipping method was generally more effective than each method applied individually for suppressing Pythium rot incidence followed by soil mixing and root dipping methods. The applied bioagents could be arranged according to their activity for suppressing the disease incidence as follows: T. harzainum, B. subtilis, T. viride and P. fluorescens, respectively. The use of biocontrol agents as soil mixing and root dipping treatments could provide additional protection against crop loss due to Pythium rot disease.

PL

W Egipcie, kapusta chińska Brassica rapa var. pekinensis jest wprowadzoną ostatnio rośliną uprawną w całym kraju wzdłuż doliny Nilu, jak również na nowo pozyskanych terenach uprawnych. Zgnilizna kapusty chińskiej spowodowana przez Pythium była wykryta w sezonie uprawy 2005/2006 w czterech gubernatorstwach w północnej części Egiptu. Przeprowadzone izolacje wykazały, że czynnikiem sprawczym choroby był grzyb Pythium ultimum. Odmiana kapusty chińskiej Napa (zielona) wykazywała wyższą wrażliwość na infekcję niż odmiana Michihli (czerwona). Trichoderma harzianum, T. viride, Bacillus subtilis i Pseudomonas fluorescents wyosobnione z rizosfery zdrowych roślin kapusty chińskiej mogły inhibować in vitro w różnym stopniu wzrost P. ultimum. W doświadczeniach szklarniowych i polowych, zastosowanie czynników biologicznego zwalczania w kombinacji zmieszania ich z ziemią plus metoda moczenia korzeni w zawiesinie patogena było zwykle bardziej efektywne niż każda z metod stosowana oddzielnie, mniej skuteczne były metody mieszania z ziemią i metoda moczenia korzeni. Zastosowane czynniki biologicznego zwalczania można by uszeregować według ich skuteczności w ograniczaniu patogenów: T. harzianum, B. subtilis, T. viride i P. fluorescent. Zastosowanie czynników biologicznych zwalczania w formie mieszania z ziemią i moczenia korzeni mogło dodatkowo chronić plon przed ewentualnymi skutkami wystąpienia zgnilizny spowodowanej przez Pythium.

Słowa kluczowe

PL

Chinese cabbage; Brassica rapa var.pekinensis; Egypt; pathogen; plant disease; Pythium ultimum; rot; occurrence; biocontrol; Trichoderma harzianum; Bacillus subtilis; Trichoderma viride; Pseudomonas fluorescens

• Wydawca: -
• Czasopismo: Journal of Plant Protection Research
• Rocznik: 2009
• Tom: 49
• Numer: 3
• Opis fizyczny: p.309-318,ref.

Twórcy

autor

El-Mohamedy R S R

• National Research Center, El-Behoos St., 12622 Giza, Egypt

autor

El-Mougy N.S.

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