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Influence of water management, application timing and temperature on efficacy of MTB‐951, a mycoherbicide using Drechslera monoceras to control Echinochloa crus‐galli L.
Author(s) -
HIRASE KANGETSU,
YOSHIGAI SATOSHI,
NISHIDA MAKOTO,
TAKANAKA KAZUNORI,
SHINMI TATSUO
Publication year - 2004
Publication title -
weed biology and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 36
eISSN - 1445-6664
pISSN - 1444-6162
DOI - 10.1111/j.1445-6664.2004.00121.x
Subject(s) - echinochloa , biology , echinochloa crus galli , horticulture , drechslera , agronomy , weed control
MTB‐951 is a potential mycoherbicide using a fungal plant pathogen ( Drechslera monoceras ) isolated from native Echinochloa species in Japan. Conidia of this pathogen were used as the active ingredient and its herbicidal performance was examined in a greenhouse. The efficacy of MTB‐951 on Echinochloa crus‐galli L. was higher in deep water (7–9 cm) than in relatively shallow water (3–5 cm). In a postemergence application, the efficacy decreased as the leaf stage of E. crus‐galli proceeded between the 1 and 2.5 leaf stage. For example, the control ratio (%) of E. crus‐galli was 95% when applied at the 1 leaf stage, and 72% at the 2.5 leaf stage in 5 cm water. Generally, mycoherbicidal efficacy was less when applied pre‐emergence rather than postemergence. Efficacy was also influenced by the duration of submergence in deep water. For example, when water depth was kept at 5 cm for more than 7 days after application and then decreased down to 3 cm, the efficacy was high. However, when the water depth was kept at 5 cm for less than 7 days, the efficacy was low. Efficacy was lower under high temperatures (35°C/25°C, day/night) than under low temperatures (25°C/15°C, day/night). Water management, application timing and temperature are important factors on herbicidal efficacy of MTB‐951 to control E. crus‐galli .