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Ornamentals and Turf |
Spider mites are quite prevalent this spring. There is a fungal disease that will reduce their populations under wet conditions; the hot, dry weather we are experiencing works against this. In addition, spider mite predators tend to be more impacted by this type of weather than the spider mites themselves. In landscapes, regularly washing plants with a strong stream of water can keep populations in check. If this is not sufficient, horticultural oil is recommended. Commercial nurseries should use a rotation of products to help prevent resistance. These include Floramite, Hexygon, Pylon, Ovation, and horticultural oil.
This week in my garden, I noticed the presence of flatid planthoppers. These are the insects responsible for that woolly-looking material on plant stems that may jump when touched. If it does, it is probably a flatid planthopper. Sometimes it is only the residue which is left behind by the insect that is noticed. Planthopper nymphs closely resemble woolly aphids in appearance and by the honeydew they secrete. The biggest difference is that planthoppers move quickly when disturbed and often jump or hop for several inches, whereas woolly aphids are more sedentary. Normally they are not found in numbers that require attention, but most of the insecticides labeled for home use will give adequate control of flatid planthoppers.
This week we have had three county Extension agents inquire about spittle masses on Leyland cypress (predominantly). There's a lot of folk lore about spittle, but we have no scientific evidence that human or bug spittle is useful to combat the evil eye. Spittlebugs are found on Leyland, other evergreens, and other plants. They may even turn up in turf. The foamy spittle is produced by honey dew that has a little air added as it is excreted. This gives the nymphal insect almost an aquatic environment in which to develop. The present nymphs should become adults in July and leave the spittle. There is typically one generation. For most plants in the landscape, spittle masses are a cosmetic problem. Unless they are overcoming the plant, strong water stream from a hose can dislodge them and disrupt them. There are contact insecticides and systemics that are also effective.
Employment and program opportunities are offered to all people regardless of race, color, national origin, sex, age or disability. North Carolina State University, North Carolina A&T State University, U.S. Department of Agriculture, and local governments cooperating.
Last modified on June 7, 2004 by Stephen J. Toth, Jr.
