Submitted to: Phytopathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/6/2003
Publication Date: 10/10/2003
Citation: Yandoc, C.B., Rosskopf, E.N., Charudattan, R. 2003. Effect of selected pesticides on dactylaria higginsii, a potential bioherbicide for purple nutsedge. Phytopathology. 93:S92. Interpretive Summary:
Technical Abstract: The suitability of a bioherbicide as a component of an integrated weed management program not only relies on its field efficacy but also its compatibility with other pest control measures that may be employed during the cropping season. The effects of selected pesticides on the biocontrol agent Dactylaria higginsii were determined using mycelial growth on pesticide-amended potato dextrose agar (PDA) and spore germination as indicators of pesticide sensitivity. Among the herbicides, oxyfluorfen and sethoxydim completely inhibited the growth of D. higginsii. Diuron and glyphosate significantly reduced mycelial growth while the growth on imazapyr-amended media was comparable to growth on PDA (control). Among the fungicides, fosetyl-Al and thiophanate-methyl completely inhibited mycelial growth while mefenoxam and copper hydroxide significantly reduced growth. The miticide dicofol completely inhibited growth while the insecticide cyromazine did not cause any growth reduction. Percent germination of spores treated with cyromazine, imazapyr, copper hydroxide, mefenoxam, and diuron were higher or equal to those treated with water (control). Germination of spores treated with thiophanate, glyphosate, sethoxydim, dicofol, fosetyl-Al, and oxyfluorfen were significantly lower than the control.