Response of selected soilborne fungi and bacteria to herbicides utilized in potato crop management systems in Maine

Leach, S. S.; Murdoch, Craig; Gordon, Corinne C.

doi:10.1007/bf02853665

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…It is generally accepted that crop root zones contain large populations of saprophytic bacteria (Lynch, 1990). Fluctuations in the root zone microenvironment, caused by agrochemicals, may provide groups of organisms with an ecologically competitive advantage, so reducing soil microbial biodiversity (Felsot et al ., 1982; Read, 1983), or may inhibit or kill specific communities of microorganisms, reducing soil fertility (Vlassek et al ., 1976; Clark & Mahanty, 1991), or they may increase or decrease the potential for plant disease development (Altman & Campbell, 1977; Leach et al ., 1991). Such agrochemical nontarget effects are well documented (Ingham, 1985; Ragsdale et al ., 1993), and in bacteria can be species specific (Sezgin, 1978).…”

Section: Discussionmentioning

confidence: 99%

“…The impact of nematicides on bacteria‐feeding nematodes are less well documented, but the effects are considered to be similar to those on plant parasites (Mulder & Bakker, 1988; Tahseen et al ., 1996a, b). Data on the effects of agrochemicals on soil microfloral populations are generally quantitative, indicating changes in total soil populations (Rodriguez‐Kabana & Curl, 1980; Chakravarty & Chartapaul, 1990; Leach et al ., 1991). There appears to be no information on the effects of nematicides on populations of plant‐growth‐promoting bacteria in root zone soils.…”

Section: Introductionmentioning

confidence: 99%

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Effects of fosthiazate and aldicarb on populations of plant‐growth‐promoting bacteria, root‐lesion nematodes and bacteria‐feeding nematodes in the root zone of potatoes

Sturz¹,

Kimpinski

1999

Plant Pathology

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A 2‐year study investigated the relationship between the nematicides aldicarb and fosthiazate and populations of plant growth‐promoting (PGP) and plant‐growth‐inhibiting (PGI) bacteria, and root‐lesion nematodes and bacteria‐feeding nematodes in the root‐zone soils of potatoes. Fewer (P < 0.05) bacterial genera and species were recovered from aldicarb‐treated soils than from the fosthiazate and untreated soils but bacterial population densities were greatest in the aldicarb‐treated soils. In potato plantlet bioassays using root‐zone bacteria from the three soil sources, bacteria from the aldicarb‐treated soils reduced (P < 0.01) the mean wet and dry weight of shoots and roots compared with those from the fosthiazate and untreated soils. In the field, fosthiazate (but not aldicarb) significantly increased tuber yields and reduced nematode population densities of Pratylenchus penetrans in roots and soil. Population densities of bacteria‐feeding nematodes (primarily Diplogaster lheritieri) were not affected by either nematicide. Aldicarb appeared to suppress the populations of plant‐growth‐promoting bacteria that contribute to enhanced growth in potatoes. This is attributed to the long‐term use of aldicarb at the trial site, which may have encouraged the selection, or adaptation, of soil microorganisms that degrade carbamate pesticides but do not enhance potato growth.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of fosthiazate and aldicarb on populations of plant‐growth‐promoting bacteria, root‐lesion nematodes and bacteria‐feeding nematodes in the root zone of potatoes

Sturz¹,

Kimpinski

1999

Plant Pathology

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“…Many studies have shown fungitoxic effects of herbicides on plant pathogens in vitro, as evidenced by inhibition of growth and reproduction of the pathogen (Katan and Eshel 1973). The herbicides triflura-lin, atrazine, paraquat, and alachlor have been shown to reduce mycelial growth of R. solani (Katan and Eshel 1973;Leach et al 1991;Rodriquez-Kabana et al 1966). Several studies have demonstrated the differential effects of herbicides on the reproductive structures of different fungi (Kawate et al 1992;Reichard et al 1997;Wilcox 1996).…”

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confidence: 99%

Influence of herbicides on growth and sclerotia production inRhizoctonia solani

Harikrishnan¹,

Yang

2001

Weed Science

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This study was conducted to determine the effects of three commonly applied soybean (Glycine max) herbicides (glyphosate, imazethapyr, and pendimethalin) on the mycelial growth, sclerotial production, and viability of Rhizoctonia solani isolates [anastomosis groups AG-1, AG-2-2, and AG-4] under controlled conditions. Pendimethalin significantly reduced mycelial growth of all three R. solani isolates investigated, whereas effects of the herbicides imazethapyr and glyphosate were not significant. Sclerotial production was affected differently by the three herbicides. Isolates AG-1 and AG-2-2 produced sclerotia both in vitro and in vivo, whereas isolate AG-4 did not produce sclerotia in vitro. In vitro AG-1 isolate showed a decrease, and AG-2-2 isolate showed an increase in sclerotial production in the presence of herbicide. In contrast, both AG-1 and AG-2-2 isolates showed reduction in sclerotial production in vivo compared to AG-4 isolate, which showed an increase in sclerotial production in the presence of herbicides. Sclerotial production was generally higher in vivo than in vitro. The number of sclerotia produced per unit sclerotial weight was often higher in the presence of herbicides. Viability of sclerotia produced in the presence of herbicides was not significantly different from the no-herbicide control.

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“…The activity of herbicides may extend beyond their target organisms. Some pathogens such as R. solani can utilize herbicides as a source of energy (Altman 1969), whereas herbicides such as trifuralin, atrazine, paraquat, and alachlor can reduce the growth of R. solani (Leach et al 1991;Rodriguez-Kabana et al 1966). Therefore, herbicide selection may play an important role in managing R. solani in crops affected by this pathogen.…”

Section: Resultsmentioning

confidence: 99%

Direct Effect of Herbicides on Plant Pathogens and Disease Development in Various Cropping Systems

Sanyal

Shrestha

2008

Weed Science

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An integrated pest management (IPM) program is a systems approach that requires an understanding of the overall agroecosystem. The interaction between different pest categories (weeds, insects, pathogens, nematodes), as well as their management practices, should be examined, understood, and taken into consideration in the design of IPM systems. Several studies have shown that plant pathogens are affected by other pests and their management practices. Herbicide application has often been cited as an example of a management practice that affects plant pathogens and disease development in various cropping systems. The activity of herbicides can extend beyond their target organisms and inhibit spore germination or mycelial growth, alter the level of phytoalexins, or interfere with other physiological processes in plants. This paper summarizes the published reports on direct effects of herbicides on plant disease and provides insights for future research on this aspect. Examples are drawn from some common agricultural herbicides and adjuvants. The discussion on various findings on herbicide and crop diseases re-emphasizes the fact that pest management in agriculture requires a systems approach. Although it is difficult to come to a common consensus on the effect of these chemicals on crop diseases or pathogens, this paper provides an overview of several interactions between herbicides and crop diseases and pathogens in various cropping systems. Knowledge of such interactions can help in the design of IPM systems.

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Response of selected soilborne fungi and bacteria to herbicides utilized in potato crop management systems in Maine

Cited by 7 publications

References 11 publications

Effects of fosthiazate and aldicarb on populations of plant‐growth‐promoting bacteria, root‐lesion nematodes and bacteria‐feeding nematodes in the root zone of potatoes

Effects of fosthiazate and aldicarb on populations of plant‐growth‐promoting bacteria, root‐lesion nematodes and bacteria‐feeding nematodes in the root zone of potatoes

Influence of herbicides on growth and sclerotia production inRhizoctonia solani

Direct Effect of Herbicides on Plant Pathogens and Disease Development in Various Cropping Systems

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