The last step in getting them ready for spring is applying horticultural oil to reduce the later occurrence of some insects and diseases. Horticultural oils used to be called “dormant oils” in ...

Dear Jane: Enclosed are leaves from my 25-foot-tall, 6-year-old Hoisen pear tree that suddenly developed black specks and spots on the underside of all of its leaves in early June. Now some leaves ...

Horticultural oil sprays are relatively nontoxic to humans, pose little danger to beneficial insects and may be combined with other pesticide controls. They can be applied with conventional spray ...

• Ortho Volck Oil Spray 16 ounces for $7.80 • Bonide All Seasons horticultural & dormant oil spray, 32 ounces for $20.

Horticultural oil must be applied directly on the pest to be effective. The spray needs to cover the entire plant, including the top and underside of the leaves, at the time the pest is present.

Spraying horticultural oil is a great preventative to do now so you have less insect and disease problems later. A very simple thing to do. There are a couple of qualifications though.

Superior oil, also called horticultural oil, is a highly refined miscible oil (up to 99.9% pure) that when mixed with water and sprayed on trees will smother overwintering insects and their eggs.

Here's the nourishing Cornell formula: 1 gallon of water, 2 tablespoons ultrafine horticultural oil, 1 tablespoon baking soda, 1 tablespoon liquid kelp (such as Maxi-Crop), 1 tablespoon mild ...

A: Oh my, don't spray either of those on your plants! They'll make plants sticky and nasty and might damage them. When I mention horticultural oil as a pest management method, I am talking about a ...

Q: I was reading your Nov. 8 column about ficus trees. I never knew they had sap until I noticed recently that the wooden table near my indoor ficus now has a sticky substance all over it. Any ...

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The last step in getting them ready for spring is applying horticultural oil to reduce the later occurrence of some insects and diseases. Horticultural oils used to be called “dormant oils” in ...