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Cooperative Extension Ventura County: Page

Olive Knot

The name comes from the fact that the disease was first identified on olives. And it can be a serious disease on olives causing severe crop loss. The causal microorganism is a bacterium which survives in the galls.
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Cooperative Extension Ventura County: Page

Powdery Mildew on Oaks

A fungus can cause odd (abnormal) branch tip growth and velvet-like growth on the leaves. The fungus is a species of powdery mildew.
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Cooperative Extension Ventura County: Page

Rose Problems

Large black spots, usually irregular in shape, on leaves are Black Leafspot disease and are caused by a fungus. The small orange spots are Rose Rust, also caused by a fungus. There are actually several rusts that infest roses.
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Cooperative Extension Ventura County: Page

Rose Virus

There are eleven known viruses that infect roses. And since all roses are propagated vegetatively (rootstocks, buds, cuttings), the viruses are propagated with the plant parts.
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Cooperative Extension Ventura County: Page

Rust on Lawns

Many cool-season grasses, for example, bluegrass, bentgrass, ryegrass and others are susceptible to attack by a rust fungus. Within these grass groups, there are cultivars with different levels of resistance to attack.
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Cooperative Extension Ventura County: Page

Rust on Roses

Rose rust is caused by a fungus that infests the leaves of roses and causes the symptoms. Rose rust will cause defoliation of your rose bush and if the leaf drop is severe, it will in time affect the vigor of the bush and flower production.
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Cooperative Extension Ventura County: Page

Algae

Most algae are actually very dark green and in low light situations appear to be black.
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Cooperative Extension Ventura County: Page

Attracting Hummingbirds

There are definitely some flowering shrubs that seem to be preferred by hummingbirds as food sources. There are species of Grevillea, Zauschneria and Agastache that hummingbirds find very attractive. Cape honeysuckle ( Tecoma sp.), bottle brush ( Callistemon sp.), Alstromeria and Pelargonium sp.
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Cooperative Extension Ventura County: Page

Broadleaved Weed Control in Lawns

There are several herbicide products available for broadleaved weed control in lawn grass. Most of these products contain 2,4-D and dicamba and are applied as a spray. There are also several Weed and Feed products sold as granular materials, which can be applied with a fertilizer spreader.
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Cooperative Extension Ventura County: Page

Controlling Oxalis by Replanting

Actually, starting over will only temporarily get rid of your problem. If your lawn is in bad shape, starting over with a new lawn may be the best solution.
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