Effect of Inoculum Concentration, Temperature, Dew Period, and Plant Growth Stage on Disease of Round-Leaved Mallow and Velvetleaf by<i>Colletotrichum gloeosporioides</i>f. sp.<i>malvae</i>

Makowski, Roberte M. D.

doi:10.1094/phyto-83-1229

Cited by 66 publications

(54 citation statements)

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“…If germinated spores survive alternating wet and dry periods, this intermittent leaf wetness may support infection (Green and Bailey, 2000) and result in satisfactory weed control as demonstrated in the case of BioMal @ (Colletotrichum gloeosporioides f. sp. malvae) on round-leaved mallow (Malva pusilla Sm) (Makowski, 1993). Formulation additives, including a range of biopolymers and oils, may prolong the wetness around germinating spores through lowering evaporation rate (Womack et al 1996;Lawrie et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Effect of plant stage, Colletotrichum truncatum dose, and use of herbicide on control of Matricaria perforata

Graham¹,

Peng²,

Bailey³

et al. 2006

BioControl

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Colletotrichum truncatum (Ct) was examined in a tank mix with the herbicide 2,4-D, clopyralid plus MCPA (Caurtail M Ò ), or metribuzin (Sencor Ò ) for control of scentless chamomile at 8-(younger) and 11-leaf stages (older) under controlled conditions. In initial trials, Ct at 7 Â 10 6 spores/ml (200 l/ha) reduced the fresh weight of scentless chamomile only slightly. However, its combinations with herbicides improved the efficacy variably depending on the herbicide used and stage of the weeds. Ct plus 2,4-D reduced the fresh weight by about 50% at both leaf stages of scentless chamomile when compared to untreated controls but no plants were killed. The fungus plus Curtail M consistently killed younger but not older plants, and the efficacy was substantially greater than that of the herbicide alone. The herbicide Sencor was highly effective on younger plants, and adding Ct did not achieve additional benefits. On older plants, however, Ct plus Sencor was substantially more effective than the herbicide alone, causing 76% fresh-weight reduction when compared to controls and killing 9 out of 16 older plants in four trials. Sencor applied alone reduced the fresh weight of older plants by 65%, but no plants were killed. Tested at doses ranging from 2 Â 10 6 to 20 Â 10 6 spores/ml, Ct plus Curtail M was most effective at the highest fungal inoculum dose, consistently killing younger but not older plants. In comparison, Ct at a medium dose (7 Â 10 6 spores/ml) plus Sencor killed the majority of older chamomile plants (7 out of 12), whereas the herbicide alone did not cause plant mortality. Further increasing fungal inoculum dose from this medium level did not enhance the weed control by Ct plus Sencor.

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Section: Discussionmentioning

confidence: 99%

Effect of plant stage, Colletotrichum truncatum dose, and use of herbicide on control of Matricaria perforata

Graham¹,

Peng²,

Bailey³

et al. 2006

BioControl

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“…Tu [43] found that disease severity in beans inoculated with Colletotrichum lindemuthianum was greater at temperatures ranging from 20 to 24°C than at lower or higher temperatures. Disease severity in round-leaved mallow inoculated with Colletotrichum gloeosporioides [44] and in soybean infected with Colletotrichum truncatum [45] increased with increase in temperatures between 10 and 25°C and sharply decreased at 30°C. With regard to incubation period, Xu [46] and Xu and Robinson [47] noted that the median incubation period was longer at lower and higher temperatures than at intermediate temperature ranges in rose and hawthorn powdery mildew.…”

Section: Discussionmentioning

confidence: 95%

Effect of Temperature on Growth and Sporulation of Botrytis fabae, and Resistance Reactions of Faba Bean against the Pathogen

Terefe¹,

Fininsa²,

Sahile³

et al. 2015

J Plant Pathol Microbiol

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“…Singh (2000) reported that warm humid weather (64-72%), low-night temperatures, and highwind velocity favor the spread of powdery mildew. Moreover, it is reported that maximum sporulation occurs between 20 and 26.9°C, with relative humidity higher than 80%, and dew point between 20-24.9°C (Makowski, 1993;Akhtar & Alam, 2000;Halleen & Holz, 2001;Sinha et al, 2001). It has also been documented that temperatures above 35°C, humidity between 50 and 70%, and wind exceeding 1.0 km h -1 favor conidial dispersal (Schoeman et al, 1995;Akhtar & Alam, 2000;Singh, 2000).…”

Section: Treatmentmentioning

confidence: 99%

Epidemiology and strategies for chemical management of powdery mildew in mango

Pérez-Rodríguez

Monteón-Ojeda

Mora-Aguilera

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to evaluate phytosanitary strategies for the chemical control of powdery mildew (Oidium mangiferae) in mango, based on the alternation of active ingredients with different modes and sites of action, and to determine the environmental and epidemiological conditions that favor the development of the disease. The experiment was conducted in Guerrero, México, in commercial orchards, within a program for the development of fungicide spraying strategies. Epidemic curves were used on temporal analyses of the disease for: incidence; area under disease progression curve (AUDPC); severity; and conidial seasonality and its relationships with meteorological parameters. The disease was better controlled with the application of systemic fungicide followed by contact fungicide with multisite activity. The first symptoms appeared 30 days after the issuance of shoots, and the most susceptible phenological (critical) stages were at full bloom and at the onset of fruit with 8-15 mm. Optimum conditions for the development of powdery mildew, which maximizes the density of airborne spores, are temperatures higher than 30°C and relative humidity over 90%.Index terms: Mangifera indica, Oidium mangiferae, epidemics, fungicide resistance, integrated pest management, multisite fungicides. Epidemiologia e estratégias para o manejo químico do míldio-pulverulento em mangueiraResumo -O objetivo deste trabalho foi avaliar estratégias fitossanitárias para o controle químico do míldio-da-mangueira (Oidium mangiferae), baseadas na alternação de princípios ativos com diferentes modos e sítios de ação, e determinar as condições ambientais e epidemiológicas que favorecem o desenvolvimento da doença. O experimento foi realizado em Guerrero, México, em pomares comerciais, no âmbito de um programa para o desenvolvimento de estratégias de pulverização com fungicida. Curvas epidêmicas foram utilizadas em análises temporais da doença quanto à: incidência; área abaixo da curva de progresso da doença (AACPD); severidade; e sazonalidade dos conídios e sua relação com parâmetros meteorológicos. A doença foi mais bem controlada com a aplicação de fungicida sistêmico seguido de fungicida de contato, com atividade multissítio. Os primeiros sintomas apareceram 30 dias após a emissão dos brotos, e os estádios fenológicos mais sensíveis (críticos) foram o de floração completa e o de frutos com 8-15 mm. As condições ótimas para o desenvolvimento do oídio, que maximizam a densidade de esporos no ar, são temperatura acima de 30°C e umidade relativa superior a 90%.Termos para indexação: Mangifera indica, Oidium mangiferae, epidemia, resistência a fungicidas, manejo integrado de pragas, fungicidas multilocais.

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Effect of Inoculum Concentration, Temperature, Dew Period, and Plant Growth Stage on Disease of Round-Leaved Mallow and Velvetleaf byColletotrichum gloeosporioidesf. sp.malvae

Cited by 66 publications

References 0 publications

Effect of plant stage, Colletotrichum truncatum dose, and use of herbicide on control of Matricaria perforata

Effect of plant stage, Colletotrichum truncatum dose, and use of herbicide on control of Matricaria perforata

Effect of Temperature on Growth and Sporulation of Botrytis fabae, and Resistance Reactions of Faba Bean against the Pathogen

Epidemiology and strategies for chemical management of powdery mildew in mango

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