Groundnut haulm quality as affected by cercospora leaf spot severity

• Autorzy: Bdliya B S

Warianty tytułu

PL

Jakosc naci orzecha ziemnego w uzaleznieniu od nasilenia cerkosporozy lisci

• Języki publikacji: EN

Abstrakty

EN

The effect of cercospora leaf spot caused by Cercospora arachidicola i Phaeoisariopsis personata on quality of groundnut haulm was assessed using official methods of analysis. The respective field experiments were conducted in 2004 and 2005 cropping seasons, while the laboratory analyses were carried out at the end of the seasons. The scale of 1-9 was used to determine severity of infection on randomly selected groundnut plants. The results showed that the year effect was not significant as related to haulm composition. However, severity of the disease was found to affect haulm composition either negatively or positively. Crude fibre, crude protein, fat and dry matter content of haulm were significantly lower in severely infected haulm samples compared to uninfected or less severely infected samples. While ash, moisture content and nitrogen free extracts (NFE) increased with increasing disease severity. The regression analysis showed that crude fibre, crude protein, fat and dry matter content were negatively related to cercospora leaf spot severity, while ash, moisture content and nitrogen free extracts showed positive relationship with increasing disease severity. Since infection by cercospora leaf spot pathogen lowers the quality of groundnut haulm, controlling the disease is necessary to ensure good quality of haulm at the end of the season.

PL

Wpływ cerkosporozy liści wywoływanej przez Cercospora arachiocola i Phaeoisariopsis personata na jakość naci orzecha ziemnego badano wykorzystując oficjalnie przyjęte metody analizy. Doświadczenia polowe prowadzono w sezonach wegetacyjnych lat 2004 i 2005, natomiast analizy laboratoryjne wykonywano pod koniec sezonów wegetacji. Do określania nasilenia porażenia wykorzystano 9-stopniową skalę. Skład naci orzecha ziemnego nie był uzależniony od lat badań. Natomiast wykazano, że nasilenie porażenia miało negatywny lub pozytywny wpływ na jej skład. Mianowicie zawartość surowego włóknika, surowego białka, tłuszczu i suchej masy naci były istotnie niższe w próbach silnie porażonych w porównaniu do nieporażonych lub porażonych w niższym stopniu prób. Natomiast zawartość popiołu, wilgoci oraz wyciągów bezazotowych wzrastała wraz ze wzrostem nasilenia porażenia. Również analiza regresji wykazała negatywną zależność pomiędzy zawartością surowego włóknika, surowego białka, tłuszczu i suchej masy nasileniem cerkosporozy liści, natomiast pozytywną zależność stwierdzono pomiędzy wzrostem nasilenia tej choroby a zawartością wilgoci, popiołu i wyciągów bezazotowych. W związku z negatywnym wpływem cerkosporozy na jakość naci orzecha ziemnego zbieranej w końcu okresu wegetacyjnego konieczne jest chemiczne zwalczanie tej choroby.

Słowa kluczowe

EN

groundnut; haulm; quality; Cercospora; leaf spot disease; plant disease

• Wydawca: -
• Czasopismo: Journal of Plant Protection Research
• Rocznik: 2007
• Tom: 47
• Numer: 3
• Opis fizyczny: p.231-241,fig.,ref.

Twórcy

autor

Bdliya B S

• University of Maiduguri, P.M.B. 1069, Maiduguri, Nigeria

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