N.Y. As many as two insecticide applications may be made for each of the two generations per year, depending on the severity of pressure. A second spray may be applied 10-14 days later. To control the second generation, the timing is 1260 DD after this same biofix date. We will be providing regular updates to identify imminent spray dates. American Plum Borer Eggs of this moth are deposited on cherry and peach trees in cracks under loose bark and hatch in a few days.
Larval tunnels are shallow with frequent openings to the outer bark, where red frass accumulates.
The larvae can't bore into the cambium unless a wound of some sort is present. Because most of the tart cherries in New York are mechanically harvested, APB has become the major borer pest in some orchards in the Lake Ontario fruit growing region. In Michigan, directed trunk sprays are recommended in cherries at petal fall, when first generation adults are emerging. Flight phenology in New York is similar. Adults begin to emerge during bloom and the flight peaks around petal fall or shortly thereafter.