Scale Insects: White peach scale crawlers should be at peak crawler emergence in southern counties. Very little recent fruit feeding has been observed. Catfacing insects are active, and activity is increasing with dry weather and summer temperatures. Growers can monitor degree day development at their site by finding the nearest weather station and using the degree day development tool at NEWA. Currently we have accumulated about 619 DD base 50 in southern counties, and 546 DD base 50 in northern counties. Additional applications with effective materials may be made between 520 and 730 DD base 50.
PLUM TREE FIRE BLIGHT PC
Applications for PC should be initiated once all petals are off, with a second application made with ovicidal materials at 379-402 DD. Plum Curculio Tarnished Plant Bugs and Other Catfacing Insects: Plum Curculio start to move into orchards at about 88-100 degree days base 50 after January 1. All timings for first generation OFM have past. Oriental Fruit Moth: A biofix point for OFM was set on 4/10 in both northern and southern counties. So far fruit symptoms are very low and only in highly susceptible varieties. Fruit symptoms from this set of infections have begun to appear in southern counties. These infections probably occurred mostly during the heavy rains that occurred on 4/30-5/1. Bacterial Spot leaf symptoms began appearing in southern county orchard during the week of 5/8.
Antibiotics such as Mycoshield or Fireline may also be used and may offer slightly more residual activity during long wetting periods. Lalancette has published a handy guide for copper applications in early covers. Also avoid acidic spray solutions when applying copper. Avoid combining copper with captan especially if it has been overcast for several days. Lalancette published a chart listing common copper formulations and rates for peach and nectarine applications. The rate applied will depend on the formulation. Bacterial Spot: Generally we recommend starting at 0.5 ozs metallic copper and gradually lowering the rate as the season progresses.
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