Effects of Growth Regulators and Multiple Applications of Pesticides on Net Photosynthesis and Transpiration of Greenhouse-grown Apple Trees1
Year: 1978
Type: article
Abstract: Succinic acid-2,2-dimethylhydrazide (daminozide) and (2-chloroethyl)phosphonic acid (ethephon) and multiple applications of selected pesticides were tested for their influence on net photosynthesis (Pn) and transpiration (Tr) of leaves of apple ( Malus domestica Borkh.). Application by aerosol, spray, soil surface incorporation, and fumigation using commercially available pesticide materials adaptable to each had no influence on Pn. Rates of aldicarb in excess of 5 g/20 cm diameter pot (2.9 liter) caused a reduction in Pn. Rates above 14 g/20 cm pot reduced Tr and induced leaf chlorosis and defoliation. One to 3 applications of diazinon, methomyl, and oxamyl had no affect on Pn or Tr but 5 applications reduced Pn and had no effect on Tr. Plictran decreased Pn of both ‘Delicious’ and ‘Golden Delicious’ leaves after 5 applications. A single application of daminozide or ethephon had no measurable influence on Pn or Tr. The growth regulators did not alter the influence of pesticides on Pn. Plictran and oxamyl increased the severity of leaf spotting on ‘Golden Delicious’.
Authors: D. C. Ferree, F. R. Hall
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: hybrid
Estimated APC paid: $3,500
OpenAlex ID: W4297948053