Resources for Commercial Horticulture
Exotic/Invasive Weeds
Poison Hemlock or Wild Chervil?
Using Pesticides
Cornell's Pest Management Guidelines
Horticulture sites
UMD Garden Pest Diagnostic key
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Things to Do in September
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- Mowing: Keep blades sharp to avoid dull mower injury. Mow newly established or renovated areas when 60 percent of the seedlings are 2.5 inches tall.
- Fertilizing: Fertilize on Labor Day. Apply 1 lb. N per 1,000 ft.2
- Scouting: Continue to sample for grubs. The orange on your lawn might be rust, a common turfgrass disease. Despite the color, it is not dangerous to
humans and can be managed through proper fertilization. - Controlling weeds: September is still the best time for postemergence broadleaf weed control. Avoid applications when temperatures are below 50° F
or before an expected rainfall




*Prepare compost pile for recycling vegetation from garden and deciduous trees. Shredded leaves, sawdust, and wood chips are needed to balance high nitrogen wastes like grass clippings and kitchen scraps. Do not compost diseased or insect-infested plant material (http://compost.css.cornell.edu/physics.html).
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September Pests and Diseases |

Late Blight of tomatoes causes spots to develop on leaves and stems. Fruit develop brown greasy areas and the entire plant can wither within days (http://vegetablemdonline.ppath.cornell.edu/factsheets/Potato_LateBlt.htm). Tomatoes may be used after cutting out blemishes. All plant material should be burned or discarded. To prevent this disease next year, follow recommendations to minimize diseases and use protectant fungicides such as chlorothalonil, mancozeb, or copper (http://plantclinic.cornell.edu/Factsheets/minimizevege/minimizevege.htm).


Disclaimer - This publication may contain pesticide recommendations that are subject to change at any time. These recommendations are provided only as a guide. It is always the pesticide applicator's responsibility, by law, to read and follow all current label directions for the specific pesticide being used. Due to constantly changing labels and product registrations, some of the suggestions given in this writing may no longer be legal by the time you read them. If any information in these recommendations disagrees with the label, the recommendation must be disregarded. No endorsement is intended for products mentioned, nor is criticism meant for products not mentioned. The author and Cornell Cooperative Extension assume no liability resulting form the use of these guidelines