Thursday, August 9, 2018
Wednesday, August 8, 2018
At this point in the growing season, my Kanza nuts are approaching full water stage. It is too early for weevils to lay eggs but both stink bug and weevil feeding can cause serious nut drop. With our below average nut set this year, I definitely want to prevent any potential nut loss.
A couple more notes on spraying. I like to spray early in the morning. The high humidity and calm winds at that time of day helps the sprayer deliver the pesticide to the entire canopy. Since I'm using a late model tractor to spray the grove, I have a digital reading of ground speed. With my 12 speed tractor, I drive in 3rd gear and average 1.9 miles per hour. I operate the fan at full throttle.
Thursday, August 2, 2018
When the calendar turns to August, I immediately think about controlling pecan weevils. If the soil contains enough moisture, male weevils will start emerging in late July. By early August, females will appear. Both sexes migrate to pecan nut clusters in the hopes of finding a suitable mate (photo above).
During this courtship phase, male and female weevils will feed on nuts causing nuts, that are still in the water stage, to drop from the tree. Female weevils will continue to probe nuts until the pecan kernel inside the nut starts to firm up. Once a female finds solid kernel they will lay 5-7 eggs inside the nut. Our job, as pecan growers, is to prevent females weevils from laying eggs.
In my orchard, the weevil population is very low so I'm not overly anxious to start spraying for weevil. However, I am planning to spray for stinkbugs next week and that spray should take care of any early emerging weevil adults. My biggest concern is that fact the my neighbors native pecan grove doesn't appear to have a crop this year. That means, any weevils that emerge across the fence will probably migrate over to my orchard.
From past experience, migrating weevils are not captured in trunk mounted traps. So this year, I'll be making a weevil spray as soon as my Kanza nuts enter the dough stage in an effort to stop migrating weevils from becoming established in my orchard.
If you want to monitor pecan weevil emergence in your grove, I'd suggest that you build some Circle pecan weevil traps. Step by step instructions for building traps can be found HERE.
Friday, July 27, 2018
|Scab lesions on Peruque, 2018|
So, I drove down to the old Pecan Experiment Field to see if I could find any scab. I started my search with two of the most scab-susceptible cultivars in our area--Peruque and Hirschi. The Pecan Field was sprayed only once this year (shortly before I retired) so my chances for finding scab were much better.
|Scab lesion on Hirschi, 2018|
|Scab on Peruque, 2015|