Effect of Trichoderma isolates, delivery systems and host genotype on biological control of cotton seedlings disease

• Autorzy: Abdel-Mongy A.A.

Warianty tytułu

PL

Wplyw izolatow Trichoderma, systemow ich aplikacji i genotypu rosliny zywicielskiej na biologiczne zwalczanie choroby siewek bawelny

• Języki publikacji: EN

Abstrakty

EN

Six isolates of Trichoderma spp. (belonging to species: Trichoderma harzianum and T. longibrachiatum) were applied as seed or soil treatments to suppress damping-off of seedlings of ten cotton cultivars under greenhouse conditions. In most cases, cultivar x isolate interaction was a highly significant (p < 0.01) source of variation in the tested seedling growth parameters: incidence of disease, seedling height, and seedling dry weight. This interaction implies that a single isolate of Trichoderma can be highly effective in controlling the disease on a cotton cultivar but may have minimal efficiency in controlling the disease on another cultivar. It was also found that, in most cases, cultivar x isolate x application method was a highly significant source of variation (p < 0.01) in the tested growth parameters. Cotton cultivars showed differences in the disease reaction to the biocontrol agents. In the experiments evaluating the Trichoderma antagonists and their effect on seedling disease, a highly significant (p < 0.01) experimental treatment interaction was found. This interaction suggests that the outcome of cultivar x isolate interaction is markedly affected by the application method. Thus, the application method should be chosen to maximize the outcome of this interaction. The degree of the control of seedling disease in cotton differed according to the isolates of antagonists, the application method and cultivars.

PL

W celu ograniczenia zgorzeli siewek 10 odmian bawełny wykorzystano 6 izolatów Trichoderma spp., zaliczanych do gatunków T. haraianum i T. longibrachiatum. Przy ich użyciu stosowano zaprawianie nasion bawełny, lub wprowadzano je do ziemi w doświadczeniu prowadzonym w warunkach szklarniowych. W większości przypadków źródłem występującej, wysoce istotnej (p < 0,01) zmienności badanych parametrów wzrostu siewek (występowanie choroby, wysokość roślin i ich sucha masa), było współdziałanie odmiany z izolatem grzyba antagonistycznego. To współdziałanie pokazuje, że izolat Trichoderma może być wysoce efektywny w zwalczaniu choroby na jednej odmianie, ale może wykazywać minimalną efektywność zwalczania na innej odmianie. Stwierdzono także, że w większości przypadków współdziałanie: odmiana x izolat x metoda jego aplikacji było wysoce istotnym (p < 0,01) źródłem zmienności ocenianych parametrów wzrostu. Wykryto różnice w reakcji chorobowej odmian bawełny na zastosowane izolaty Trichoderma. Oceniając wpływ antagonistycznych izolatów oraz sposób ich zastosowania na zgorzel siewek bawełny stwierdzono wysoce istotne (p < 0,01) współdziałanie tych czynników. Sugeruje to, że współdziałanie: odmiana x izolat jest w dużym stopniu zależne od zastosowanej metody ich aplikacji. Należy więc wybierać metodę pozwalającą na maksymalizację korzystnego aspektu tego współdziałania. Stopień zwalczania zgorzeli siewek bawełny różnił się zależnie od izolatu grzyba antagonistycznego, metody jego aplikacji oraz odmiany bawełny.

Słowa kluczowe

EN

Trichoderma; isolate; delivery system; plant host; plant genotype; biological control; cotton; seedling; plant disease; growth parameter; seed coating

• Wydawca: -
• Czasopismo: Journal of Plant Protection Research
• Rocznik: 2007
• Tom: 47
• Numer: 3
• Opis fizyczny: p.339-356,fig.,ref.

Twórcy

autor

Abdel-Mongy A.A.

• Agricultural Research Center, Giza, Egypt

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