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Sunday, January 15, 2017

My Blog is My Gardening Book

Q. Have you written any gardening books? You are such a wealth of information.

A. My blog is my "gardening book". It is freely accessible to anyone with internet and people can add information to it or correct mine if they think it is not the best advice.

In many ways I feel educational blogs are better than books. My blog receives anywhere from 30.000 to 40,000 views each month (could be compared with opening a book and reading a page) with over one million views over its lifespan. How many times does a book get opened?

Views and questions are from all over the world with the most views coming from the United States, Russia, Ukraine, France, India, Canada, Australia, South Korea, Germany, China and others. How else can you get worldwide distribution of your "book"? I have kept sales advertisements off of my blog for the present time. I have been considering it as I get closer to "retirement". We will see what the future brings.

Friday, January 13, 2017

Horticultural Oil Preferred During Winter

Q. Do you prefer Neem oil or Horticultural oil when spraying fruit trees?
A. Horticultural oil is used for spraying trees and shrubs when leaves are absent during the winter. Horticultural oils, sometimes called dormant oil or even dormant spray, have a very specific viscosity or “thickness” which makes them effective in killing pests. These oils are petroleum-based and refined so they don’t damage plants if applied correctly.
            When spraying trees, fruit trees and shrubs make sure the entire plant is covered with horticultural oil from “head to foot”. Neem oil is used primarily during the growing season when leaves and the offending insects are present.
            Neem oil is a bit “trendy” right now. And it is plant-based rather than petroleum-based which for some is important. One major difference between neem oil and horticultural oil is the “toxicity” of neem oil toward some insects. Horticultural oil is not “toxic” on its own. It relies on “suffocating” insects for control.
            Remember, just like many “organic” pest control chemicals, neem oil is nondiscriminatory in what it kills. It cannot recognize a good insect from a bad insect. You direct the spray towards pests you want to control or food that you want to protect. This is also true of horticultural oils but, unlike neem oil, is frequently applied when leaves and fruit are not present.
            Neem oil has been promoted for disease control. A little known fact is that horticultural oils will control nearly all of the same diseases as neem oil. Similarly, horticultural oils can be applied when leaves and fruit are present as long as temperatures are below 80° F.
            Personally, I have never found neem oil particularly effective in killing pests although I do use it in rotation with soaps and other organic pest controls. I worry a little bit that there is a wide variation in the “quality” of neem oils being produced and available on the market. Horticultural oils are pretty much all the same. Stay with name brands of neem oil.

Mounds of Dirt in Lawn from Earthworms

Q. Our Bermudagrass lawn is covered with little "mounds" of dirt. Something is digging in or digging out of the dirt and I suspect it can't be good!  Grubs?  What do I do? 

Mounds of dirt created by earthworms in a lawn

A. These mounds appear in lawns after a long rain or if the soil has been flooded. Those mounds of dirt are excavations from earthworms. Earthworms move to the soil surface when they can’t get enough air, leaving behind little piles of dirt. We also see it in soils that are compacted for the same reason.
earthworm channel
            There are many earthworms in our soils particularly where plants are growing. They provide a lot of benefit to the soil and recycle nutrients from decaying plants and very small animals like insects. They also create air and water channels in the soil.
            Earthworms do not like to be exposed but they will come to the surface if they can’t get the air that they need. The only way they do that is by digging these channels to the open air. In some parts of the country earthworm populations are so dense they create problems when they surface, leaving behind the piles of dirt you’re seeing. In cases like these, people are more likely to ask how to get rid of earthworms.
            In your case, don’t worry about it. It’s a good sign. These mounds will disappear after a few more things. If the problem persists and it does bother you, aerate the lawn with a commercial core aerifier and dethatch it.