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- Author or Editor: Calvin E. Arnold x
Abstract
Development of pubescence was studied in peach [Prunus persica (L.) Batsch. cv. June Gold]. Mean trichome length and density were determined on ovaries collected in anthesis to ripe fruit stages. Mean trichome length increased during an thesis until petal fall, then decreased by a factor of 10 to fruit ripening. Pubescence density did not consistently increase or decrease between anthesis and shuckoff, but did show a major decrease on ripe fruit. The dense appearance of pubescence at petal fall may be due largely to increased trichome length.
Abstract
Methazole [2-(3,4-dichlorophenyl)-4-methy1-1,2,4-oxadiazolidine-3,5-dione] napropamide [2-(α-naphthoxy)-N,N-diethylpropionamide], oryzalin [3,5-dinitro-N4 ,N4 -dipropyl-sulfanilamide], oxadiazon [2-tert-butyl-4-(2,4-dichloro-5-isopropoxyphenyl)-∆2-l,3,4-oxadiazolin-5-one], and simazine [2-chloro-4,6-bis(ethylamino)-s-triazine] each at 4.5 kg/ha were applied preemergence on June 17, 1976 in a nursery of 6-month-old seedlings of peach [Prunus persica (l.) Batsch cv. Nemaguard]. Though simazine and oryzalin provided better weed control, oxadiazon increased seedling height and trunk diameter from 25 to 89 days after application. All treatments impeded bark adhesion (slippage) 25 days after application but not after either 56 or 89 days. No phytotoxicity was observed from any treatment.
Abstract
Melfluidide [N-{2,4-dimethyl–5-[[(trifluoromethyl)sulfonyl]amino]phenyl} acetamide] applied at 0, 0.9, 1.9, 3.7, 5.6 and 7.5g/liter to 2nd leaf peach [Prunus persica (L.) Batsch cv. June Gold] on June 14,1976 induced a dwarfing effect on tree height 70 days following treatment which was maintained for the duration of the experiment (471 days). The number of lateral branches increased as early as 100 days after treatment. Lateral branch length was less than that of the check trees. Mefluidide reduced trunk diameter growth over the control. The lowest rate of mefluidide produced slight phytotoxicity but increasing rates caused severe defoliation and other types of phytotoxicity including tree mortality.
Abstract
Anatomical and morphological similarities in flower and fruit development exist among cultivars of peach and nectarine [Prunus persica (L.) Batsch ‘June Gold’, ‘Harvester’, and ‘ArmKing’] and some other members of Rosaceae. The abscission of peach and nectarine fruit involves events at 3 recognizable zones between the fruit and the stem. Of these 3 zones, the most distal is the most complex and does not form a discrete separation layer. The basal zone is predominant in samples treated with the ethylene releasing compound, CGA-15281 [(2-chloroethyl) methyl-bis (phenlymethoxy) silane]. Mature fruit from untreated plants generally abscise at the most distal zone.