Development of models to predict product deposition from coverage obtained on artificial collectors and their practical application

Abstract

Models to relate the observed coverage on artificial collectors used in field tests (water-sensitive paper, WSP) and in laboratory bioassays of citrus pests (pieces of polyvinyl chloride sheets, PVC) with product deposition are described. Different solutions of plant protection products commonly used for pest control in citrus were sprayed in a Potter Tower on PVC and WSP under the same controlled conditions. These experiments led to the formulation of different basic models to relate coverage and deposition depending on the products and collectors. The best fitting model was selected from among those that had highest coefficients of determination (R 2 ) and lowest estimation error (RMSEP), and at the same time resulted in a normal distribution of residuals. Finally, coverage on pieces of PVC sheets was related with coverage obtained on WSP by different equations depending on the product being applied. Such equations can be used to link laboratory and field results in order to assess the quality of a spray application in citrus cultivation.

Quantifying pesticide deposits and spray patterns at micro‐scales on apple (Malus domesticus) leaves with a view to arthropod exposure

“…Stains on WSP are larger than the area covered by the initial droplet due to the solution spreading . As WSP absorbs and expands the aqueous portion of a pesticide spray, it has been suggested that the measurement of WSP stains can overestimate the liquid deposition, as the stains created appear larger than the initial droplet. However, through using a spread factor, this error can be accounted for.…”

Comparison between standard and drift reducing nozzles for pesticide application in citrus: Part II. Effects on canopy spray distribution, control efficacy of Aonidiella aurantii (Maskell), beneficial parasitoids and pesticide residues on fruit

“…The evaluation of spray coverage was done prior to the application of experimental treatments; therefore water was sprayed during these experiments. A previous study showed that similar coverage on WSP is obtained with both Reldan® and water (Garcerá et al, 2014b). Once the trees were sprayed and the WSP had dried, the pieces were collected and stored in dry conditions.…”

Assessing the Ability of Image Processing Methods of Droplets Sprayed on Water Sensitive Papers for Aerial Application

“…Some advanced technologies, such as geographic information systems, differential global positioning, electronic-guidance, on-site meteorological monitoring, and remote sensing, can optimize herbicide application for maximum efficacy and environmental protection [3]. Cruz Garcera opened a possibility to estimate the deposition of a plant protection product in field applications from coverage values measured on WSP [4].…”