Iatrogenic effects of captafol on bacterial blight of coffee

Kairu, G. M.; Nyangena, C. M. S.; Javed, Zoya; Crosse, J. E.

doi:10.1111/j.1365-3059.1984.tb00596.x

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…A further example of an iatrogenic effect on coffee is the exacerbation of bacterial blight (Pseudomonas syringae pv. garcae) caused by captafol when used for CBD control (Kairu et al 1984). Microfloral components of the phylloplane have also been shown to influence the incidence and behaviour of a number of other plant pathogens (Blakeman 1981;Fokkema and Van den Heuvel 1986).…”

Section: Introductionmentioning

confidence: 98%

The microflora of coffee surfaces and relationships to coffee berry disease

Waller

Masaba

2006

International Journal of Pest Management

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Data from previous trials that have been re-evaluated indicate that low levels of coffee berry disease on unsprayed coffee are associated with higher populations of microflora on coffee tissues. Samples were taken at different seasons and altitudes, and from coffee plots receiving different fungicide treatments for the control of coffee berry disease. Although largest populations occurred at the highest altitudes, the relative proportions of microflora components varied with altitude. Fungicides reduced populations of filamentous fungi on all tissues. Trees that had never received fungicide had low populations of Colletotrichum kahawae and had very low levels of coffee berry disease. The disease was also at a lower level on trees that had not been sprayed with fungicides for two seasons where microflora populations were highest. The likely effects of microflora components on coffee berry disease and their potential as biological control agents are discussed.

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Section: Introductionmentioning

confidence: 98%

The microflora of coffee surfaces and relationships to coffee berry disease

Waller

Masaba

2006

International Journal of Pest Management

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“…The results (Table 1) show that thiabendazole (at the dosage rate used) is not only ineffective in controlling A. radicina but increases its incidence on carrot seed. Diseases which are induced or increased in severity by specific fungicides treatments have been referred to as iatrogenic (Griffiths, 1981;Kairu et al, 1984). Several mechanisms may be involved in iatrogenesis but in this instance the absence of common seed-associated fungi such as A. alternata on plated seeds suggests that the removal of competitive or antagonistic organisms may be an important factor.…”

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confidence: 99%

Thiabendazole as an iatrogenic agent in carrot black rot

Reifschneider

Vecchia

1985

Plant Pathology

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Negligible amounts of carrot (Daucus carota L.) seed were produced in Brazil prior to the release of cv. Brasilia in 1982. This cultivar is tolerant of high temperature and resistant to leaf blight caused by Alternaria dauci (Kühn) Groves & Skolko (Vieira et al., 1983). Since 1982 technology for production of Brasilia seed has developed rapidly and over 40 t of seed have been produced, representing more than 8000 ha planted. Fungicides are widely used on carrot root crops and growers have naturally extended their use to carrot seed crops. Mancozeb, thiabendazole, captafol and chlorothalonil, applied at weekly intervals, are the most common fungicides used although their efficacy in this new situation has not been evaluated. A survey of pathogens associated with carrot seed production (Reifschneider & Della Vecchia. 1983) has shown that the most common fungal pathogen is Alternaria radicina Meier, Dreschler & Eddy, a species which is a common seed‐borne pathogen in the USA (Rader, 1952) and has been present in Brazil since 1970 or earlier (Luz, 1970). Since information concerning the control of A. radicina in carrot seed crops is lacking we established a preliminary fungicide experiment in July 1982 within a 5‐ha commercial field planted with artificially vernalized roots of which 90% were infected, to varying degrees, with A. radicina. Plots were 25 m2 and each treatment (Table 1) was replicated five times, in a completely randomized design. Seeds were harvested manually at maturity and dried by forced air at c. 30°C. Infection by A. radicina was detected using the method of Soteros (1979) in which heat‐treated seeds (100°C for 1 h) are plated on malt agar. A total of 200 seeds per plot (20 seeds per plate) were used. Identification of A. radicina was based on conidium and conidiophore morphology (Ellis & Holliday, 1972).

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Introduction to Pest Management in Tropical Forestry

Speight¹,

Woodward²

2015

Tropical Forestry Handbook

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Iatrogenic effects of captafol on bacterial blight of coffee

Cited by 6 publications

References 5 publications

The microflora of coffee surfaces and relationships to coffee berry disease

The microflora of coffee surfaces and relationships to coffee berry disease

Thiabendazole as an iatrogenic agent in carrot black rot

Introduction to Pest Management in Tropical Forestry

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