Control of pistillate flower abortion in ‘Serr’ walnuts in Chile by inhibiting ethylene biosynthesis with AVG
The research paper discusses the issue of pistillate flower abortion (PFA) in the ‘Serr’ walnut variety, which is prevalent in Chile and other walnut-producing regions. PFA, caused by excessive pollen load on female flowers, leads to significant fruit set reduction and potential yield loss. The study investigates the use of AVG (aminoethoxyvinylglycine), an ethylene biosynthesis inhibitor, as a means to control PFA and enhance fruit set.
Over two growing seasons, trials were conducted to evaluate the effectiveness of AVG at various concentrations (62.5, 125, and 250 mg/l) and application volumes (1000 or 2000 liters per hectare). In the first season, untreated controls showed an average fruit set of only 25%. However, applying AVG at concentrations of 125 and 250 mg/l significantly increased fruit set to 80%, with the 125 mg/l concentration and 1000 liters per hectare being identified as the most effective treatment.
In the subsequent season (2005/2006), AVG was applied at 125 ppm across several orchards. The natural fruit set in untreated controls varied between 35% and 83%. Despite a lower incidence of PFA compared to the previous season, AVG application still resulted in increased fruit set, particularly in orchards experiencing high PFA. The findings suggest that AVG is a valuable tool for mitigating PFA and enhancing yield potential in ‘Serr’ walnut orchards under the conditions of the Chilean Central Valley.
This research paper is significant in the field of agricultural science, particularly in the study of plant hormones and their effects on fruit production. By addressing the challenge of PFA in walnuts, the research contributes to ongoing discussions about improving fruit yield and quality in nut production. The findings provide practical insights for walnut growers, offering a potential solution to a common problem that can lead to substantial economic losses. The use of AVG as a treatment not only enhances fruit set but also supports sustainable agricultural practices by potentially reducing the need for more harmful chemical interventions. Overall, the article serves as a valuable resource for researchers, agronomists, and farmers interested in optimizing walnut production.
