Numerous Fungicide Options a Boon for California Peach Growers

Brown Rot on Peaches

Brown Rot on Peaches

The University of California’s IPM Guidelines list 37 fungicide products available for controlling diseases in peach orchards. Major flower, foliar and fruit diseases of peach include peach leaf curl, shot hole, brown rot, powdery mildew and rust. The key is to select the best fungicide product with the broadest spectrum of activity against these pathogens and time the application at a critical stage.

“Fungicides are the most effective and safe way for managing diseases of cling peach. Fortunately, there are numerous choices because multiple fungicides with different modes of action (MOA) are registered for each disease. This may appear to make a decision more difficult, but having multiple active ingredients available allows for competitive pricing, development of highly effective management programs that target problematic diseases at individual orchard sites, and resistance management. …In recent years, many active ingredients have become available as generic products under different trade names. This has further increased the complexity but also allows for reducing fungicide costs to the grower.”

Author: Adaskaveg, J. E.
Affiliation: UC Riverside
Title: Effective and Economical Management of Flower, Foliar, and Fruit Diseases of Cling Peach
Source: Orchard Notes. January 2014. Pgs. 2-4.

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Herbicides Help to Control Nematodes in Orchards

Nematode Damage

Nematode Damage (R)

Prior to the 1950s farmers of orchard crops in California had plenty of new land available as an alternative to replanting land that had previously been in production. However, with growing population and increased land values, a greater proportion of fruit and nut production has been on land where older orchards have been removed. Farmers frequently encounter growth problems when they replant. In severe situations, new plants die. Plant parasitic nematodes that are present on old roots are a common cause of the replant problem.

“Orchard removal and site preparation for walnuts can be extensive and expensive, but worth the time and expense to get new plantings off to the best start, according to Joe Connell, University of California Cooperative Extension farm advisor for Butte County.

Nematodes are a main concern, and the first thing that a grower should do is collect a soil sample from the feeder roots in the old orchard and have a nematode analysis done, Connell said.

After the soil testing, the next step is to cut down the trees, and then treat the stump with a herbicide, Connell said. Treating the stumps kills the entire root system, and it will kill out the nematode population that is attached to that root system, he added.”

Author: Coatney, K.
Affiliation: Reporter
Title: Walnut site preparation is essential for healthy orchards.
Source: Ag Alert. January 30, 2013.