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Pear trellis rust products include Nova (grp 3) and Pristine (grp 7,11). These spores can travel long distances through weather currents. When pear leaves start to emerge from buds and precipitation is expected, protect new foliage against Pear Trellis Rust ( Gymnosporangium fuscum) infections. hail) has occurred, creating wounds for entry of fireblight bacteria into new branches.Īnd don’t forget those Gymnosporangium rusts: Secondary summer infections may be possible in June/July where storm damage (e.g. The floral stigmas are the main entry point for fireblight into the tree. Floral applications of products for Fireblight (such as copper, Kasumin, streptomycin) should begin at early bloom and continue throughout the bloom period to reduce numbers of fireblight bacteria on floral structures (stigmas). Always rotate fungicides between chemical groups/families.įIREBLIGHT. During cool, wet leaf emergence periods, 3 fungicide applications can really help reduce disease incidence.

The biological Serenade (grp 44) is an option where use of traditional fungicides is not feasible. Some newer fungicide options include Luna Tranquility (grp 7,9) and Fontelis (grp 7). Apple Scab products include Nova, Banner (grp 3), Pristine (grp 7,11), Compass (grp 11) and Captan (grp M4). Repeat fungicide applications every 7-10 days until petal fall (leaf expansion). Protect new leaf tissue starting at Green Leaf Tip throughout leaf emergence, especially before precipitation events.

For Apple Scab, the disease enters through emerging leaf tissue (and fruit tissue) and for Fireblight, the disease enters through the floral stigmasĪPPLE SCAB on Apple.

Apple scab is caused by a fungus and Fireblight is caused by a bacteria, and.Management programs are different for each disease.

ALWAYS ALWAYS ALWAYS DISINFECT PRUNING TOOLS WHEN PRUNING APPLE/CRABAPPLE AND PEAR. STORM DAMAGE) SPRAY RUBBING ALCOHOL OR FUNGICIDE ON THE WOUND TO PREVENT DISEASE ENTRY. Leaf wetness periods during bloom will also increase the success of those primary floral infections of fireblight bacteria.ĪVOID PRUNING APPLE/CRABAPPLE AND PEAR FROM BUD SWELL TO LATE SUMMER TO AVOID CREATING WOUND ENTRY POINTS FOR FIREBLIGHT INTO THE TREE. Temperatures need to be greater than 18C for fireblight bacteria to be active and the risk of fireblight will increase with increasing temperatures (THIS WEEKEND), peaking at 24C. Typically, both of these disease organisms require warm, moist conditions to successfully infect host tissue.