Q: What is the proper fertilizer for topiaries? The tips of the branches appear to dry out. L.F.,

Miami

A: The branch dieback is most likely caused by improper watering (too much, usually), disease, mite damage, inappropriate type of plant for South Florida, etc. The cause needs to be identified before any remedy should be applied. Contact your local UF Extension office for diagnosis and recommendations.

To prevent the spread of disease, use clean shears and clippers when shaping topiaries. Disinfect with rubbing alcohol.

In general, most established plants in the ground don't need additional fertilization since fertilizer from nearby lawns supplies needed elements.

Q: Enclosed in a medicine bottle are some ants that I need to have identified. Do you have any suggestions on how to control them?

B.B., Pembroke Pines

A: You sent ghost ants, which are very small, with a black body and white abdomen. They have a high need for moisture and are often seen in kitchens and bathrooms. They feed on sweets and sugars and nest in rotten wood outdoors and in the bases of palm fronds.

Trim surrounding vegetation around your house so plants are not touching the walls. Fix any water leaks in the house. Boric acid baits have shown promise but should be renewed often. There are other ant baits available. Look for products that state ``kills the entire colony'' or ``kills the queen.'' Because of their small size and large number of potential nesting areas, control is difficult.

Ants don't harm homes or plants but they are a nuisance and can be a challenge to control.

Adrian Hunsberger is an entomologist/horticulturist with the UF/IFAS Miami-Dade Extension office. Write to Plant Clinic, 18710 SW 288th St., Homestead, FL 33030; e-mail aghu@ifas.ufl.edu.

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