Apple Rots Reappear Because of Fungicide Cancellations

 

Core rot

Core rot

 

Many storage rots of apples are actually initiated in the orchard. There are often no pre-harvest symptoms. Core rot is a wet rot that spreads into the flesh of the apple. Core rot can be controlled with spring fungicide sprays in the orchard. However, core rot has reappeared in some Australian apples in storage due to cancellation of some key fungicides.

“In the last couple of months I have attended to a couple incidences of core rot in apples that have arrived in their destination market. This is not a pretty sight and costs the packer/marketers both in financial and brand terms, not to mention degradation of Australia’s reputation as a supplier of quality fruit.

This situation has probably arisen due to low levels of core rots being encountered in the last 15 or so years. This has meant that this problem has slipped from our memories and we have forgotten that in the 1980s core rot could be present in up to 20 per cent of our fruit. This level of infection cannot be tolerated in today’s marketing environment. Its re-appearance is probably due to the de-registration of both Benlate and Rovral for spraying onto the apple flowers, a treatment in common use in the 1990s and 2000s for the control of core rots.”

Author: Brown, G.
Affiliation: Technical Editor.
Title: Getting to the core of the problem: Core rots.
Source: Australian Fruitgrower. September 2012. Pgs. 12-15.

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French Apple Production Requires Dozens of Pesticide Sprays every Year

Codling Moth

Codling Moth

Apple Scab

Apple Scab

French apple production totals about 1.9 million tons worth approximately $750 million annually. French apple orchards are plagued with the same major pests that infest orchards worldwide: the fungal disease, apple scab, and the insect, codling moth. Both pests would seriously damage most of the apple crop in France without the dozens of pesticide sprays that are made.

[1]
“In Southern France, over 35 pesticide treatments are applied yearly in apple orchards, among which 8-15 are targeted against the codling moth.”

[2]
“Codling moth is a major pest of pome fruit orchards throughout their area of cultivation…. Two or three larval generations are present in southern France and insecticide applications are needed from the beginning of the first larval generation in May until fruit harvest.”

[3]
”Chemical control of apple scab represents a considerable part of the pest control measures necessary to protect an apple orchard when it is planted with one or several cultivars susceptible to the disease. In France, as many as 15-20 fungicide treatments per year may be necessary to control the disease.”

[1]
Authors: Monteiro, L. B., Lavigne, C., Ricci, B., Franck; P., Toubon, J-F
Affiliation: UFPR, Parana Federal University; INRA Plantes et Systemes de Culture Horticoles
Title: Predation of codling moth eggs is affected by pest management practices at orchard and landscape levels.
Source: Agriculture, Ecosystems and Environment. 2013. 166:86-93.

[2]
Authors: Simon, S., et al.
Affiliation: Unite Experimentale Gotheron, Institut National de la Recherche Agronomique.
Title: Effect of codling moth management on orchard arthropods.
Source: Agriculture, Ecosystems and Environment. 2007. 122:340-348.

[3]
Authors: Brun, L., et al.
Affiliation: INRA, UMR Pathologie Vegetale.
Title: Effects of apple cultivar susceptibility to Venturia inaequalis on scab epidemics in apple orchards.
Source: Crop Protection. 2008. 27:1009-1019.