Field evaluation of strobilurins and a plant activator for the control of citrus black spot

Miles, A. K.; Willingham, S. L.; Cooke, A. W.

doi:10.1071/ap04025

Cited by 43 publications

(52 citation statements)

References 16 publications

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“…Further testing of acibenzolar was not pursued, as it seemed unlikely that acibenzolar could offer any commercial brown spot control. This is in contrast to our citrus black spot experiments, where acibenzolar reduced the incidence of black spot (50% reduction compared with the untreated control), but not as much as the industry standard copper/mancozeb or the strobilurins (60% to over 90% reductions compared with the untreated control) (Miles et al 2004). The difference is most likely due to the differences in epidemiology between A. alternata and G. citricarpa.…”

Section: Discussioncontrasting

confidence: 54%

“…Similar results have been demonstrated in the USA for brown spot, as well as the other citrus diseases melanose (caused by Diaporthe citri) , scab (caused by Elsinoe fawcettii), post-bloom fruit drop (caused by Colletotrichum acutatum) and greasy spot (caused by Mycosphaerella citri), (McMillan 1998;. We also found that fruit treated with azoxystrobin, methoxycrylate, iprodione and chlorothalonil/pryrimthanil sustained significantly less rind damage than those treated with copper/mancozeb alone, as found in our concurrent studies evaluating chemicals for citrus black spot (caused by Guignardia citricarpa) control (Miles et al 2004).…”

Section: Discussionsupporting

confidence: 51%

“…In our other evaluation experiments it has also shown low toxicity to the citrus integrated pest management insect Amblyseius victoriensis (Miles et al 2004). However, the product was tested in only one season and experiments with this product should be repeated.…”

Section: Discussionmentioning

confidence: 99%

“…It is not surprising that our results showed trifloxystrobin to be less effective than azoxystrobin as both these products contain 50% a.i, yet the rates of product used were far less for trifloxystrobin, than for azoxystrobin. The rates of trifloxystrobin used in experiment 2 were originally determined from earlier experiments screening for control of citrus black spot, where trifloxystrobin at the rate of 0.07 g/L was as effective as azoxystrobin at 0.4 g/L (Miles et al 2004). However, under the different orchard conditions and pathosystem in these experiments, trifloxystrobin at 0.15 g/L could not satisfactorily reduce the incidence of brown spot.…”

Section: Discussionmentioning

confidence: 99%

“…Fungicide treatments incorporating mancozeb greatly reduce populations of Amblyseius victoriensis on mandarin cv. Nova, as well as increase rind damage (Miles et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Field evaluation of a plant activator, captan, chlorothalonil, copper hydroxide, iprodione, mancozeb and strobilurins for the control of citrus brown spot of mandarin

Miles

Willingham

Cooke

2005

Austral. Plant Pathol.

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Abstract. Brown spot (caused by Alternaria alternata) is a major disease of citrus in subtropical areas of Australia. A number of chemicals, the strobilurins azoxystrobin, trifloxystrobin, pyraclostrobin and methoxycrylate, a plant activator (acibenzolar), copper hydroxide, mancozeb, captan, iprodione and chlorothalonil/pyrimthanil were tested in the field for its control. Over three seasons, trees in a commercial orchard received 16, 14 and 7 fungicide sprays, respectively, commencing at flowering in the first season, and petal fall in the later seasons. In all experiments, the strobilurins used alone, or incorporated with copper and mancozeb, were as effective as, or better than the industry standard of copper and mancozeb alone. The only exception was trifloxystrobin, which when used alone was less effective than the industry standard. Acibenzolar used alone was ineffective. Applying a mixture of azoxystrobin and acibenzolar was found to reduce the incidence of brown spot compared with applying azoxystrobin alone but, in either case, disease levels were not found to be significantly different to the industry standard. Captan, iprodione and chlorothalonil/pyrimthanil were as effective as the industry standard. The incidence and severity of rind damage were significantly lowest in the azoxystrobin, methoxycrylate, iprodione and chlorothalonil/pyrimthanil treatments. Medium and high rates of trifloxystrobin (0.07 g/L, 0.15 g/L) and pyraclostrobin (0.8 g/L, 1.2 g/L) applied alone were the only treatments found to be IPM-incompatible as shown by the elevated level of scale infection on fruit.

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Section: Discussioncontrasting

confidence: 54%

Section: Discussionsupporting

confidence: 51%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Fungicide treatments incorporating mancozeb greatly reduce populations of Amblyseius victoriensis on mandarin cv. Nova, as well as increase rind damage (Miles et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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