Tuesday, March 27, 2012
Flowering type noticeable at bud break
You can easily see which flowering habit a cultivar will have by close observation of bud break. Here is a photo of emerging new growth from two pecan cultivars: Oswego and USDA 75-8-5. Oswego is protogynous while USDA 75-8-5 is protandrous. Note that the catkins on the protandrous cultivar are already well developed while catkins on the protogynous cultivar are barely showing (red arrow points to emerging catkins).
Besides watching for the time of pollen shed, you will note that catkins produced by protandrous cultivars are short and fat while the catkins produced by protogynous cultivars are long and narrow.