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  • Author or Editor: D. E. Short x
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Abstract

Five plant species [burford holly (Ilex cornuta Lindl. and paxt. ‘Burfordii’) golden-rain tree [Koelreuteria elegans (Seem. A.C. Sm.], ligustrum (Ligustrum japonicum Thunb.), hibiscus (Hibiscus rosa-sinensis L.), and podocarpus (Podocarpus macrophyllus Thunb.)] were arranged in a 5 × 5 × 5 factorial experiment and sprayed with 4 pesticides (dimethoate, dicofol, malathion, oxydemeton methyl) and water alone, as well as 4 chemicals [ancymidol, ethephon, gibberellic acid (GA3)] and water alone. Growth regulators increased pesticide phytotoxicity ratings, whereas the antitranspirant had no effect on phytotoxicity ratings.

Open Access

Abstract

Seedlings of Dizygotheca elegantissima (Hort. Veitch) R. Vig & Guillaum (false aralia) were grown for 90 days under maximum, photosynthetically active radiation (PAR) of 797 or 278 μmol s−1m−2 and then treated with 2 pesticides (diazinon or dicofol) in 2 formulations [emulsifiable concentrate (EC) or wettable powder (WP)]. Plants were sleeved, held under simulated shipping conditions for 5 days at 22° ± 1°C, followed by simulated foliage plant warehouse conditions for 10 days at 20° ± 1°. Root and shoot quality ratings were 2-fold better at 278 than 797 μmol s−1m−2 PAR. Light compensation points (LCP) and percentage of total nonstructural carbohydrate (TNC) levels were lower while root TNC levels were higher in plants grown under 278 than 797 μmol s−1m−2 PAR. The percentage of leaf abscission ratio of 278 and 797 μmol s−1m−2 PAR plants was similar to their LCP ratio. Plants had higher tissue levels of N, P, and K and lower levels of Mg and Ca grown at 278 than 797 μmol s−1m−2 PAR. Canopy width of dicofol WP-treated plants grown under 797 μmol s−1m−2 PAR decreased during simulated shipping and warehousing. Pesticide effects on other measurements were not detected.

Open Access