Search Results
You are looking at 1 - 3 of 3 items for
- Author or Editor: Steven J. Fischer x
Abstract
Sixty-eight poinsettia cultivars (Euphorbia pulcherrima Willd.) were exposed to a population of greenhouse whitefly (Trialeurodes vaporariorum Westw.) for 9 weeks. Evaluation was based on 6 degrees of infestation by immature stages of whitefly on the bracts and upper and lower foliage. The upper foliage showed the heaviest infestation and was considered to be the best indicator of relative susceptibility. White bracts were more heavily infested than red bracts, while pink bracts were intermediate. A wide range in degree of whitefly infestation was found among poinsettia cultivars. Certain cultivars tested for 2 years showed appreciable resistance to infestation (‘U.S.D.A. 68-82-1’, ‘U.S.D.A. 68-160-2’, ‘Annette Hegg Maxi’, ‘Red Baron’, ‘Rudolph’).
Abstract
Increasing levels of the systemic insecticide 2-methyl-2-(methylthio)propionaldehyde O-(methylcarbamoy)oxime (aldicarb) and a plant growth retardant (2-chloroethyl)trimethylammonium chloride (chlormequat) reduced the mean population of whitefly on poinsettia (Euphorbia pulcherrima Willd.). Chlormequat was effective only with the low level or with no aldicarb.
Abstract
The insect growth regulator (IGR) kinoprene reduced infestation by immature stages of greenhouse whitefly (Trialeurodes vaporariorum Westw.) on ‘Dramatic’ and ‘Puritan’ chrysanthemum (Chrysanthemum morifolium Ramat.) and ‘Annette Hegg Lady’ and ‘Eckespoint C-1’ poinsettia (Poinsettia pulcherrima Wild.). Three foliar applications at 2-week intervals were more effective than 1 or 2 applications. The plant growth regulators (PGR) ancymidol and chlormequat reduced whitefly infestation on both cultivars of chrysanthemum and ‘Annette Hegg Lady’ poinsettia.