Insecticides labeled for use by homeowners against scale crawlers on oaks include cyfluthrin, permethrin, bifenthrin, cyhalothrin, and malathion. Apply one of these materials when crawlers appear and repeat the spray application in 10 days.
Treatment: In general, the best treatment includes pruning dead twigs and branches during dormancy; also prune to increase air and light circulation. Rake leaves when they fall and destroy them. For severely damaged trees, apply an appropriate fungicide to protect new growth.
Acorn growth regulators can be sprayed on the trees when they bloom to prevent acorn formation.
The catkins will begin to fall in the early spring when the weather starts to warm up. They'll typically take about two or three weeks, depending on the local conditions.
If the layer of catkins is less than an inch thick, try mowing. If it mostly disappears with mowing, there is no need to remove it. If, however, the grass is covered with a layer over an inch thick and is completely buried, rake up what you practically can and put it into beds as mulch or put it in your compost pile.
In spring, a single oak tree produces both male flowers (in the form of catkins) and small coon flowers (female flowers), meaning that the tress are monoecious. Oak trees have male flowers on one part of their branch, and female flowers on another part of the same branch.
The fat catkins can be used as you would any vegetable - in soups, in skillet dinners, in stir-fries. But I think that all of those applications mask the delicate flavor of cottonwood catkins. They are however, quite lovely quick-sauteed in butter.
#2 – Suck Them Up
Once the acorns are on the ground with no tarp below, you'll be left to figure out how to pick them up. One of the best methods to do so is using a leaf vacuum. While the name suggests that it is suited to sucking up leaves in the fall, it should do the work for acorns just the same.
The very popularity of acorns as a food source means that most years very few are left to turn into oak trees. However, by using the boom and bust strategy 'predator satiation' occurs. Each time a huge crop of acorns is produced the predators simply cannot eat all of them, leaving more to grow into oak trees.
Clipping. One effective way to decrease acorn production is by pruning or trimming the branches of oak trees. Since acorns come from oak trees, selectively removing some of the branches can significantly reduce the number of acorns produced each season.
There are no requirements to treat oak and you can leave it untreated. That said, for outside structures, treating with an Osmo Oil 4001 WR base coat will defend oak against damp, mildew, rot, blue stain, and wood-boring insects. For the removal of tannin stains, you can spot clean with Oxalic Acid Crystals.
Watering, pruning and using oak tree fertilizer on a regular basis will help keep oak trees healthy and better able to tolerate stress, insect and disease conditions or other tree problems.
In yard settings where healthy oaks are extremely valuable to homeowners, and nearby oaks have oak wilt, homeowners may consider hiring an experienced, professional arborist to inject their healthy red or bur oaks with a fungicide containing propiconazole.
The roots of most trees spread outwards, so it is important to allow enough space for the tree to reach its full potential. By taking these factors into consideration, you can ensure that your tree will be a welcome addition to your home for years to come.
1) Environmental conditions, such as heavy spring rains, growing season flood events, drought, and unusually high/low temperatures, can cause poor acorn pollination, acorn crop abortion, and complete acorn crop failures. 2) Early season frosts can severely damage oak flowers resulting in poor pollination success.
In the spring the buds of the oaks burst in a matter of days after the weather becomes sufficiently warm, generally in mid-April in our area. The flowers appear first and the leaves begin unfolding a few days later. A single oak tree produces both male and female flowers.
Male catkins are yellow, each around 6cm long and grow in rows, hanging down from the branch in a curtain. The female flowers are tiny and red, with fine filaments protruding to catch the pollen. These can be found on short stalks called peduncles and will develop into acorns by autumn.
If this is the case, here is the magical fix you were looking for: mow them down! It's as easy as that. It will likely take several mows (3-4) to kill them off, but just keep at it and they will eventually disappear!
The trees are dropping male catkins, which carry the male flowers of the tree. Use them as mulch or throw them in the compost when they start to pile up.
Once Sudden oak death infects oak trees, there is no known way to cure them. Therefore, most of the management practices discussed below are directed at preventing the spread of the disease to new plants or areas and protecting susceptible trees before they are infected.
Just be sure to mop up spills straight away – oak is porous, so can easily soak up water, which will damage the finish. Use a paper towel or a clean cloth. Don't clean oiled oak furniture with a wet or damp cloth as this can strip protective oils from the table and might leave a mark.