EFFICACY OF PATHOGENIC FUNGI AND COMBINATION USE WITH THE HERBICIDE TO CONTROL ECHINOCHLOA CRUS-GALLIN RICE FIELDS

摘要

Exserohilum monoceras (EM) and Drechslera monoceras (DM) were two potential promise pathgenic fungi for biological control of barnyardgrass (Echinochloa crus-galli (L.) Beauv.). Most barnyardgrass seedlings at 1.0～5.0-leaf stage were killed by spraying E. monoceras and D. monoceras suspension respectively at dosage of 5.0x10~7 conidia m~2 with 24h dew exposure period. Treatments of E. monoceras at 5.4x10~6 and D. monoceras at 5.9x10~6 conidia M~2 reached 66.1% and 64.4% dry weight reduction of barnyardgrass respectively. Combination use of E. monoceras and D. monoceras with Quinclorac of 5.6mg a.i. m~(-2) improved a better control of barnyardgrass and reduced the plant height and dry weight of rice seedlings significantly.