Thrips and Wind Scarring on GEM Avocado Fruit – A Study on Two Locations in Ventura County Funded by the California Avocado Commission First Year Report
The objectives of this study are to determine if the scarring observed on young GEM avocado fruit is caused by wind or avocado thrips feeding and to determine if wind screens, insecticide applications, or organosilicon surfactants (e.g., Silwet®) can significantly reduce the scarring of young GEM avocado fruit.
This study has provided critical, science-based information to the California Avocado Commission and herbicide registrants to pursue additional product labels. The objectives of this study were: 1. Determine the safety and efficacy of herbicides currently registered for citrus for use on bearing avocado. 2. Identify both pre and post emergent alternatives to glyphosate and simazine.
In this research, we have modeled the relationships between leaf nutrient concentrations and the yields of avocado trees with the aim of developing decision support tools for improved fertilization and nutrient management to increase avocado fruit yields. Using a data base of ~3500 observations in which nutrient concentration profiles and yields of individual trees were examined over several harvest seasons, we now present in our final report a refined model that predicts nutrient-yield relationships based on all possible combinations for the 11 elements that are monitored by leaf analyses.
Use of Plant Growth Regulators to Increase Fruit Set, Fruit Size and Yield and to Manipulate Vegetative and Floral Shoot Growth
This research addresses the research priority: “The role of endogenous and exogenous growth regulators in avocado and the evaluation of commercial growth regulators on flowering, fruit set, fruit size, yield and vegetative growth.”
The increasing costs of inputs necessary for avocado production dictate that growers of the 'Hass' avocado in California increase profitability per acre. The goal of this research is to increase net income per acre by developing plant growth regulator (PGR) strategies that increase yield of commercially valuable fruit.
California avocado growers must increase yield, including fruit size, and/or reduce production costs to remain competitive in the US market, which now receives fruit from Mexico, Chile, New Zealand, Dominican Republic and an increasing number of other countries (http://www.ers.usda.gov/Data/Fruit VegPhyto/Data/fr-avocados.xls). Despite the popularity, the ‘Hass’ cultivar (Persea americana Mill.) is known to be problematic with regard to fruit retention, fruit size and alternate bearing.
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