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why do plant leaves turn brown on the edges

Brown leaf margins have other causes, including excess fertilizer when the symptom occurs in houseplants. Houseplants generally do best with monthly fertilizing in spring through fall, with one-half the recommended fertilizer strength used. For example, dilute 1/2 teaspoon of liquid houseplant fertilizer, instead of 1 teaspoon of it, per 1 quart of water. The appearance of a white crust on a houseplant's potting soil or container is a sign of excess fertilizer salts; four times in one hour, water the plant until the water leaks out its container's drainage hole to leach the excess fertilizer salts from the container and soil.

Two-spotted spider mites feed on leaves and may cause symptoms that resemble leaf scorch. The mites, however, also produce a fine webbing and stippling on the leaves. Two-spotted spider mites often become resistant to miticides, but adequate watering for your particular plants can help the plants resist two-spotted spider mite infestations.
Botrytis blight, caused by the fungus Botrytis cinerea, forces discoloration, wilt, decay and premature drop of flowers, leaves and shoots.

This pathogen prefers moist conditions and mild temperatures, so it is best combated by thinning out the plant, pruning out infected portions and avoiding overhead watering. The lantana leafblotch miner, the larvae of Liriomyza species, feeds within leaves and causes brown or gray blotches and premature leaf drop. Pruning out infested leaves, avoiding the use of broad-spectrum insecticides and providing the lantana with good cultural care usually achieves adequate control of this pest and encourages rapid plant recovery.

Various species of whiteflies feed on lantana and are potentially responsible for leaf yellowing and drop. Whiteflies also excrete a sticky, sweet substance known as honeydew that hosts the development of sooty mold. Populations of these pests, though difficult to control completely, are reduced by removing heavily-infested leaves, spraying infested plants with a strong blast of water and avoiding the use of pesticides that harm whitefly predators.

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