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Effects of selected pesticides and adjuvants on germination and vegetative growth of Phomopsis amaranthicola, a biocontrol agent for Amaranthus spp.

Wyss, Gabriela; Charudattan, R; Rosskopf, E and Littell, R (2004) Effects of selected pesticides and adjuvants on germination and vegetative growth of Phomopsis amaranthicola, a biocontrol agent for Amaranthus spp. Weed Research ( Weed Research 2004 44), pp. 469-482.

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Summary

Summary:
Phomopsis amaranthicola, a bioherbicide agent for Amaranthus spp., was tested in vitro for its compatibility with commercial formulations of 16 adjuvants, 24 herbicides, nine fungicides and four insecticides at 2X, 1X (highest labelled product dose rate), 0.75X, 0.5X and 0.25X concentrations. These chemicals were tested for their effects on spore germination. Selected herbicides and fungicides at 1X were also tested for their influence on colony growth and sporulation. All tested compounds were finally categorized in compatibility classes regarding germination, mycelial growth and sporulation such as low, medium and high compatibility. High compatibility in terms of germination and fungal colony growth was only observed with the herbicide bentazone.
Many of the adjuvants tested were highly compatible in the germination studies. Most fungicides and insecticides had medium and low compatibility with P. amaranthicola.
Effects of pesticides on spore germination did not fully correspond with their effects on colony growth. Thus, it is possible to integrate the use of P. amaranthicola with some herbicides, fungicides, insecticides and adjuvants but not others. A case-by-case selection of application methods, such as tank-mix or sequential application, along with proper timing of applications of the fungus and the chemical agents will be necessary.


EPrint Type:Journal paper
Keywords:adjuvant, Amaranthus spp., bioherbicide, biological control, compatibility, herbicide, fungicide,insecticide, Phomopsis amaranthicola, Qualitätssicherung, Kontamination
Subjects: Food systems > Food security, food quality and human health
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Food Quality
Related Links:http://www.fibl.org/english/research/food-quality/index.php
Deposited By: Wyss, Dr. Gabriela S.
ID Code:5924
Deposited On:13 Oct 2005
Last Modified:12 Apr 2010 07:31
Document Language:English
Status:Published
Refereed:Not peer-reviewed

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