Effect of the fungicide mancozeb on fungi associated with sugarcane yield decline in Queensland

Magarey, R. C.; Yip, HY; Bull, J. I.; Johnson, E.J.

doi:10.1017/s0953756297003511

Cited by 19 publications

(12 citation statements)

References 3 publications

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“…For example, soil fumigation has been shown to increase yield of crops that were previously suffering from yield decline, suggesting an association between soil microorganisms and constrained productivity (Magarey, 1996; Pankhurst et al , 2005 c ; Sumner et al , 1990; Turco et al , 1990). Other forms of soil sterilisation, such as solarisation, or the application of nematicides or soil‐applied fungicides, have also been shown to improve yields where yield decline previously occurred, as has the application of beneficial microorganisms to soil (Magarey, 1996; Magarey et al , 1997; Pankhurst et al , 2003; Schippers et al , 1987). The contribution of deleterious microorganisms to yield decline has also been implicated in transfer studies.…”

Section: Yield Declinementioning

confidence: 99%

“…Further experimental work showed that soil pasteurisation, fumigation, and solarisation all improved the growth of sugarcane, again implicating detrimental soil organisms in yield decline (Magarey, 1996; Pankhurst et al , 2003). Root symptoms in yield‐decline‐affected plants included a reduction in fine root density, browning of root surfaces and reduction in root hair development (Magarey et al , 1997). However, application of the fungicides benomyl and mancozeb to soils from yield decline‐affected areas reduced these root symptoms and resulted in positive growth responses, suggesting that soil fungi in particular were important (Magarey, 1996).…”

Section: Yield Declinementioning

confidence: 99%

“…Circumstantial evidence suggests that dematiaceous fungi may be involved in yield decline as pathogenicity tests showed that out of over 200 isolates of diverse genera tested, this group caused growth reductions of 15–30% in glasshouse pot experiments (Magarey, 1996). In addition, isolation of dematiaceous fungi from roots was reduced when soil was treated with mancozeb (Magarey et al , 1997), although further field studies were required to verify the true impact of this fungal group on yields of field‐grown sugarcane (Magarey et al , 1997; Pankhurst et al , 2003).…”

Section: Yield Declinementioning

confidence: 99%

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Meeting the demand for crop production: the challenge of yield decline in crops grown in short rotations

et al. 2011

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There is a trend world-wide to grow crops in short rotation or in monoculture, particularly in conventional agriculture. This practice is becoming more prevalent due to a range of factors including economic market trends, technological advances, government incentives, and retailer and consumer demands. Land-use intensity will have to increase further in future in order to meet the demands of growing crops for both bioenergy and food production, and long rotations may not be considered viable or practical. However, evidence indicates that crops grown in short rotations or monoculture often suffer from yield decline compared to those grown in longer rotations or for the first time. Numerous factors have been hypothesised as contributing to yield decline, including biotic factors such as plant pathogens, deleterious rhizosphere microorganisms, mycorrhizas acting as pathogens, and allelopathy or autotoxicity of the crop, as well as abiotic factors such as land management practices and nutrient availability. In many cases, soil microorganisms have been implicated either directly or indirectly in yield decline. Although individual factors may be responsible for yield decline in some cases, it is more likely that combinations of factors interact to cause the problem. However, evidence confirming the precise role of these various factors is often lacking in field studies due to the complex nature of cropping systems and the numerous interactions that take place within them. Despite long-term knowledge of the yield-decline phenomenon, there are few tools to counteract it apart from reverting to longer crop rotations or break crops. Alternative cropping and management practices such as double-cropping or inter-cropping, tillage and organic amendments may prove valuable for combating some of the negative effects seen when crops are grown in short rotation. Plant breeding continues to be important, although this does require a specific breeding target to be identified. This review identifies gaps in our understanding of yield decline, particularly with respect to the complex interactions occurring between the different components of agro-ecosystems, which may well influence food security in the 21(st) Century.

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Section: Yield Declinementioning

confidence: 99%

Section: Yield Declinementioning

confidence: 99%

Section: Yield Declinementioning

confidence: 99%

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Meeting the demand for crop production: the challenge of yield decline in crops grown in short rotations

et al. 2011

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“…kg −1 soil, but the response was low after 100 mg a.i. kg −1 soil [10]. The root-growth response with fungicides such as benomyl and analazin was low compared to mancozeb [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Soil-Applied Fungicides on Sugarcane Root and Shoot Growth, Rhizosphere Microbial Communities, and Nutrient Uptake

et al. 2018

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Sugarcane (Saccharum spp. hybrid) successive planting (also called monoculture) causes serious yield losses and its management is not well studied in Histosols. Based on very few studies in other sugarcane regions, root colonization by harmful soil fungi is considered as a major cause of this yield decline, but there is lack of knowledge on its management in Histosols. A two-year greenhouse study was conducted with soil-drench application of mancozeb, mefenoxam, and azoxystrobin fungicides to determine their effects on early root and shoot growth, soil microbial communities, and nutrient uptake by plants. The study indicated that mancozeb soil application improved sugarcane-shoot and -root dry matter by 3–4 times and shoot-root length, fine-root length, and root surface area by 2–3 times compared to untreated soil. Phospholipid fatty acid (PLFA) analyses of sugarcane rhizosphere soil showed significant reduction in fungal-biomarker abundance with mancozeb and azoxystrobin in comparison to the untreated check or mefenoxam treatments. Bacterial functional-group abundance was reduced by mancozeb and mefenoxam. All fungicides significantly reduced mycorrhizal colonization but not mycorrhizal spore counts. There was a functional relationship between fine-root systems and higher tissue concentration of nitrogen and silicon. The study indicated that application of fungicides to the soil may improve early root and shoot growth and plant-cane establishment that can potentially reduce the yield decline in successively planted sugarcane in histosols. Additional field research is needed in the future to determine the fungicide soil application method, sugarcane growth response in whole crop cycles, and any environmental effects.

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“…Yield decline has also been associated with an increase in root pathogenic fungi, including Pythium spp. and a dematiaceous sterile fungus; thus broad spectrum fungicides, such as mancozeb [manganese ethylenebis (dithiocarbamate) (polymeric) complex with zinc salt], have been recommended (19). Research in Australia has also shown that interrupting the sugarcane monoculture may reduce sugarcane yield decline.…”

Section: Introductionmentioning

confidence: 99%

Sugarcane Yield Response to Soybean Double-cropping in Louisiana

2011

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Planting a soybean [Glycine max (L.) Merr] crop during the fallow period between sugarcane plantings represents an economical opportunity for sugarcane growers in Louisiana. The objective of the experiment was to determine if soybean grown in the fallow period would affect the primary crop, sugarcane, through cane yield, theoretical recoverable sugar (TRS), and sugar yield. The experiment was conducted in two successive years (2004 and 2005) with two sugarcane varieties: ‘L 97‐128’ and ‘HoCP 96‐540.’ With and without starter fertilizer at the time of planting sugarcane was included to determine if potential yield loss associated with soybean could be mitigated with fertilizer. Soybean did not reduce cane yield, TRS, or sugar yield, with mean values of 48 tons/acre, 220 lbs/ton, and 10,400 lbs/acre, respectively. Plant‐cane yield was marginally higher in fields cropped to soybean (49 tons/acre) when compared to fallow (47 tons/acre) (P = 0.072). There was no sugarcane variety or starter fertilizer response observed. Across years soybean yielded 40 bu/acre, which at current commodity prices ($11.45/bu) make the crop worth $460/acre. Calculated total observed costs for the soybean crop were $214/acre, with a net profit of $246/acre. Overall, soybean cropped between sugarcane plantings provide an economic incentive to growers and does not affect subsequent sugarcane yields.

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Effect of the fungicide mancozeb on fungi associated with sugarcane yield decline in Queensland

Cited by 19 publications

References 3 publications

Meeting the demand for crop production: the challenge of yield decline in crops grown in short rotations

Meeting the demand for crop production: the challenge of yield decline in crops grown in short rotations

Effects of Soil-Applied Fungicides on Sugarcane Root and Shoot Growth, Rhizosphere Microbial Communities, and Nutrient Uptake

Sugarcane Yield Response to Soybean Double-cropping in Louisiana

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