honey dew and sooty mold covering their leaves as compared to the leaves of all other cultivars in the trial. I'm not suggesting that Gardner is resisitant to aphid feeding because I saw definite signs of aphid feeding on the leaves. However, less honeydew on the foliage indicates that fewer aphids were feeding on these Gardner trees.
In future years, I'll need pay particular attention to how Gardner fares during an outbreak of black-margined aphids.
Gardner is similar to Pawnee in terms of ripening date and the nut even looks a lot like Pawnee. However, Gardner nuts appear more round in cross-section as compared to the more flattened Pawnee. Also like Pawnee, Gardner has a protandrous habit and is susceptible to pecan scab. Fortunately, scab did not appear to be a problem for any of cultivar in our trial this year.
Wednesday, September 17, 2014
Monday, September 15, 2014
|Mullahy, 15 Sept 2014|
Even though the shuck had split, the Mullahy nut inside had not fully developed its brown shell color and the nut was so wet with moisture, beads of water formed on the shell of the nut (photo at left). This pecan will need a couple of weeks drying time before the kernel would become dry enough to be considered edible.
late spring freeze we experienced last April is going to play havoc with the normal order of ripening this year. Osage broke bud early in the spring and suffered serious freeze damage. Osage trees re-budded from primary buds located at the base of last year's shoots but the need to re-leaf threw the timing for pistillate flower formation back by a couple of weeks. As a result, Osage nut development has been behind schedule all season. When I pulled a Osage nut from the tree and cut into the shuck, I found not even the slightest indication that this cultivar had started shuck dehiscence (photo above left). Osage will ripen well before frost this fall but it will probably split shuck at least 2 weeks later than normal.
Friday, September 12, 2014
Black-margined aphids produce huge amounts of honeydew as they feed. The honeydew quickly covers the leaves with a sugary-sticky film giving the leaves a glossy appearance. Over time, the black sooty mold fungus colonizes the honeydew painting the leaves black (photo at right). The sooty mold fungus grows entirely on the honeydew and does not actually infect the leaves. In fact, you can take your finger nail and scrape the fungus off the surface of the leaves.
Wednesday, September 10, 2014
|Warren 346, 10 Sept. 2014|
Warren 346 is an interesting pecan cultivar based strictly on its early ripening date. The original tree was found in a native pecan grove near Wheeling, MO down in the Grand River flood plain. The native trees in this area of Missouri are growing in the extreme northwestern corner of the pecan tree's native range.
Warren 346 nuts are small, averaging 4.72g/nut (96 nuts/pound). Pecan kernel is above average for a native pecan, averaging nearly 51% nut meat. The tree has an upright growth habit and is prone to developing branches with narrow crotches.