Efficacy of Exserohilum longirostratum on barnyard grass (Echinochloa crus-galli spp. crusgalli) under field conditions

Ng , , S.C and Kadir, J and Sajili, Mohammad Hailmi and Rahim, AA (2011) Efficacy of Exserohilum longirostratum on barnyard grass (Echinochloa crus-galli spp. crusgalli) under field conditions. Biocontrol Science and Technology, 21 (4). pp. 449-460. ISSN 0958-3157 (Print) 1360-0478 (Online)

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Abstract

An isolate of Exserohilum longirostratum obtained from Rottboelia cochinchinensis in Malaysia was highly pathogenic to barnyardgrass (Echinocloa crus-galli,) a serious weed in rice fields in Malaysia. In glasshouse trials, high levels of barnyardgrass control were achieved when E. longirostratum was applied as a conidial concentration at 105 conidia/mL. This conidial concentration may not be sufficient for field use; therefore, a mini plot trial was carried out to assess the bioherbicidal potential of the fungus and the efficacy of different inoculum types under field conditions. Excellent barnyard grass disease as indicated by Area Under Disease Progress Curve (AUDPC) was achieved with mycelium (AUDPC �583.8 unit2 ); myceliumpretichlaclor (AUDPC �610.4 unit2 ) and conidia alone (AUDPC �468.3 unit2 ) compared to conidiapretichlaclor (AUDPC �395.8 unit2 ). Although conidia caused lower disease severity on barnyard grass compared to mycelium, this inoculum equally reduced the competition from barnyard grass as indicated by lower mean dry weight and fewer barnyard grass tiller numbers. Positive correlations between AUDPC of rice and its tiller number and AUDPC of rice and its dry weight were recorded while negative correlations were observed for the AUDPC of barnyard grass and its tiller number and AUDPC of barnyard grass and its dry weight. These findings confirmed that E. longirostratum applied either in the form of conidia or mycelium was effective against barnyard grass under field conditions. Keywords: field efficacy; bioherbicide; barnyar

Item Type: Article
Subjects: S Agriculture > S Agriculture (General)
Faculty / Institute: Faculty of Bioresources & Food Industry
Depositing User: Mr. MOHAMMAD HAILMI SAJILI
Date Deposited: 22 Feb 2015 03:06
Last Modified: 22 Feb 2015 03:06
URI: http://erep.unisza.edu.my/id/eprint/2468

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