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Plant Diseases 

What are some common diseases of Tomatoes?
Many factors cause problems with tomato crops. These range from insects and diseases to weeds. A crop profile for tomatoes written by several experts is accessible by clicking here. It contains a ton of valuable information on problems with your tomatoes.

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Phomopsis Tip blight on Juniper.
Mary Ann Hansen has written an excellent article on Juniper Tip Blights which you can reach by clicking here.

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Fireblight (cherry, apple).
Fireblight is a bacterial disease that can kill branches or trees, especially "Gala," "Jonathan," "Granny Smith," "Paulared," "Mutsu," "York," and "Jonagold" varieties. New varieties have been bred for resistance to apple scab and sometimes cedar apple rust, powdery mildew, or fireblight.
Trees are susceptible to Fireblight at the Pink (pink tissue appears in flower buds), and Bloom (50% - 80% of flowers are open) stages and may be sprayed with a fungicide. Around May, any evidence of fireblight should be removed in order to ensure the safety of your tree.

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Black Knot (cherry, peach, etc.)
Black Knot looks like rough, black elongated galls on the branches. Branches affected by Black Knot will be restricted from proper growth and black knot will spread to the other parts of the tree, so prune out and remove the infected branches before early spring to prevent such an occurance.

You can get more information on the Cornell Cooperative Extension page by clicking here.

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Cedar-Apple Rust
Paula Flinn of the Iowa State University Department of Pathology has written a very informative article on Cedar-Apple Rust which can be reached by clicking here.

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Shot Hole Fungus
A factsheet on Shot Hole Fungus can be found by clicking here.

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Dogwood Spot Anthracnose
Mary Ann Hansen has written an excellent article on foliar diseases of Dogwood, including Spot Anthracnose which you can reach by clicking here.

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Anthracnose of Maple and Sycamore
An article by R.J. Stipes and Mary Ann Hansen on Anthracnose of Maple and Sycamore can be found by clicking here.

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Powdery Mildew
Mary Ann Hansen has written an article on Powdery Mildew which should tell you everything you need to know which you can reach by clicking here.

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Black Spot on Roses
Mary Ann Hansen has written an article on Rose Black Spot which you can reach by clicking here.

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Tomato Septoria Leaf Spot
Mary Ann Hansen has adapted an article by R.C. Lambe about Septoria Leaf Spot of Tomato which you can reach by clicking here.

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Blossom End Rot
Marry Ann Hansen has adapted an article by Robert Pristou and R.C. Lambe on Blossom End Rot of Tomato which you can reach by clicking here.

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Phytophthora Root Rot on Rhododendron
An article by Mary Ann Hansen which goes into the details of Phytophthora root rot on Rhododendron and Azalea can be reached by clicking here.

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Entomosporium leaf spot on Photinia
Mary Ann Hansen has written an article on Entomosporium leaf spot on Photina which you can reach by clicking here.

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Slime Mold on grass
Joseph W. Rimelspach and Michael J. Boehm have written an article on Slime Molds on grass which you can reach by clicking here.

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Brown patch in grass
Information on the brown patch fungus can be found by clicking here. Also, to avoid brown patches in your grass, water before 11 AM, avoid fertilizing in the spring, and try to make sure the grass gets exactly an inch of water each week by regulating your sprinklers as needed.

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