Tolerance of southern highbush and rabbiteye blueberry cultivars to saflufenacil

Abstract

Greenhouse and field studies were conducted to determine tolerance of blueberry to saflufenacil. Greenhouse studies included five saflufenacil rates (0, 50, 100, 200, and 400 g ai ha−1) and three southern highbush blueberry cultivars (‘Legacy’, ‘New Hanover’, and ‘O’Neal’) and one rabbiteye blueberry cultivar (‘Columbus’). Saflufenacil treatments were soil applied into each pot when blueberry plants were approximately 30-cm tall. Visible injury (purpling/reddening of foliage and leaf abscission) ranged from 3% to 12%, 3% to 42%, 0% to 43%, and 0% to 29% with saflufenacil from 50 to 400 g ha−1 in Columbus, Legacy, New Hanover, and O’Neal, respectively, at 28 d after treatment. Regardless of injury, plant growth (change in height), soil plant analysis development, and whole-plant dry biomass of all cultivars did not differ among saflufenacil rates. Field studies were conducted in Burgaw, NC, to determine the tolerance of nonbearing (<3-yr-old and not mature enough to produce fruit) and bearing (>3-yr-old and mature enough to produce fruit) southern highbush blueberry (‘Duke’) to saflufenacil application at pre-budbreak or during the vegetative growth stage. Treatments included three rates of saflufenacil (50, 100, and 200 g ha−1), glyphosate (870 g ae ha−1), glufosinate (1096 g ai ha−1), glyphosate (870 g ha−1) + saflufenacil (50 g ha−1), glufosinate (1096 g ha−1) + saflufenacil (50 g ha−1), and hexazinone (1,120 g ai ha−1), applied POST-directed to the soil surface beneath blueberry plants in a 76-cm band on both sides of the blueberry planting row. The maximum injury from treatments containing saflufenacil was ≤11% in both nonbearing and bearing blueberry. No negative effects on plant growth or fruit yield were observed from any treatments. Results from both greenhouse and field studies suggest that saflufenacil applied at 50 (1X commercial use rate) and 100 g ha−1 is safe to use in blueberry.

Assessment of Physicochemical Quality, Antioxidant Content and Activity, and Inhibition of Cholinesterase between Unripe and Ripe Blueberry Fruit

“…Blueberries ( Vaccinium spp.) are classified into three types, namely the low-bush, high-bush, and rabbit-eye blueberries [ 10 ]. Low-bush blueberries are wild blueberries native to the northeast of the United States and Canada.…”

“…High-bush blueberries are mainly grown in Florida and southern Michigan in the US as well as in eastern Canada. Their average height is about 2–3 m. Rabbit-eye blueberries are native to southeastern US and are grown in warmer winters as they have less cold hardiness [ 10 , 11 ].…”

Journal of Plant Protection Research

“…The experiments investigating the response of common bean cultivars to the herbicide saflufenacil applied pre-and post-emergence revealed greater bean tolerance in pre-emergence and greater tolerance differences among cultivars at this application time, in relation to post-emergence spraying. In post-emergence, saflufenacil doses that were smaller than those recommended by commercial product labels, were sufficient to trigger characteristic effects of this herbicide, which are described in the literature as the rapid loss of cell membrane integrity, tissue necrosis, and plant death (Hao et al 2011;Aldridge et al 2019). The action of some of the PPO-inhibiting herbicides can be enhanced when they are applied to the seedling shoots, combined with the addition of adjuvants (Castro et al 2013).…”

Tolerance of muscadine grape to 2,4-D choline postemergence-directed

“…Ten samples of 50 berries, randomly selected across the plots, were collected and weighed to calculate average unripe berry weight. Unripe berry weight was converted to estimated ripe berry weight using the mean sample weight of ripe and unripe berries and average vine yield per plot, a similar equation used for blueberry yield (Equation 1) (Aldridge et al 2019; Coneybeer-Roberts et al 2016; Meyers et al 2016, Sims et al 2022) as follows: …”