Search Results
Abstract
The tumid spider mite (Tetranyehus tumidus banks) is the most common and destructive spider mite species on palms in nursery and landscape plantings. Treatments with two applications of aldicarb, dienochlor, Tricychohexyltin hydroxide (Dowco-213), propargite, oxythioquinox, and hexakis (beta, beta-dimethylphenethyl)-distannoxane, (SD-14114), left less than 1 mite per 3 leaflet sample on container-grown parlor palms (Chamaedorea elegans Mart.). This degree of control was also obtained but with phytotoxicity by chlordimeform, 0-[5-chloro-1-(methylethyl)-1H-1,2,4-triazol-3-yl] 0,0-diethyl phosphorothioate (CGA-12223), oxamyl, and S-tricyclohexyltin 0, 0-diisopropyl phosphorodithioate (R-28627). Other miticides which caused significant population reduction and no phytotoxicity were acephate and tetradifon. Treatments of chlorobenzilate, dicofol, and formetanate reduced populations significantly but resulted in plant damage.
Abstract
Grevillea chrysodendron, an ornamental tree similar to Grevillea robusta Cunn., the silk oak, is native to North Queensland, Australia, and was grown and observed for 6 years at the Agricultural Research Center (ARC), Ft. Lauderdale. During that time 28 trees flowered and shed over 300,000 seeds of which over 300 sprouted in an adjacent fallow field and attained heights of 1 to 2 meters within 2 years. Because of its potentially weedy nature, the planting and the seedlings have been destroyed. The Florida ecosystem is a fragile one which already contains too many escaped, exotic ornamentals.
Abstract
Methyl sulfanilylcarbamate (asulam) was effective for the selective control of several grassy weeds in established st. augustinegrass (Stenotaphrum secundatum (Walt.) Kuntze), ‘Tifway’ bermudagrass (Cynodon dactylon L.), and ‘Emerald’ zoysiagrass (Zoysia matrella Merr.). Bahiagrass (Paspalum notatum Flugge) and centipedegrass (Eremochloa ophuroides (Munro) Hack.) were severely injured when asulam was used at a rate of 2.24 kg ai/ha. Thirty-six species of ornamental plants were relatively tolerant to foliage applications of asulam at rates of 2.24 and 4.48 kg ai/ha with growth normal on all but 4 ornamental species 22 weeks following treatment.
Abstract
Sprigs of ‘Tifgreen’ bermudagrass (Cynodon dactylon L.) and seeds of ‘Argentine’ bahiagrass (Paspalum notatum Flügge) were planted in 10 different media consisting of combinations of 5 waste products spread 10 cm deep on black polyethylene plastic sheets. Experiments were conducted in 1976 and 1977 utilizing the following media components: composted heat-treated sewage sludge (SS); composted sugarcane processing byproducts (SB); composted municipal wood chips (WC); sandy muck soil (SM); and water treatment sludge (WS). In 51 days the bahiagrass had formed sod which was comparable in tear strength to commercially available sod. Excellent rooting of the experimental sod occurred in 7 days; commercially cut sod had rooted much less as determined by root weights and the force required to uproot the sod. Bermudagrass sprigs did not develop sufficient coverage in 51 days to yield acceptable sod but did so by 65 days. The sod also rooted more quickly than commercial bermudagrass sod. Both grasses rooted better than commercial sod because root apical meristems were not cut off during harvesting. The media which resulted in the best and worst combinations of evaluations were different for each grass species. Excellent quality bahiagrass sod was produced in media containing SS, and the least acceptable in WC+SS and WS+SB media. A system now exists to make use of a number of urban waste products for sod production, while at the same time shortening production time.