Abstract
Fungal diseases are important factors limiting common bean yield. White mold is one of the main diseases caused by soil pathogens. The objective of this study was to quantify the distribution of a fungicide solution sprayed into the canopy of bean plants by spectrophotometry, using a boom sprayer with and without air assistance. The experiment was arranged in a 2 x 2 x 2 factorial (two types of nozzles, two application rates, and air assistance on and off) randomized block design with four replications. Air assistance influenced the deposition of solution on the bean plant and yield increased significantly with the increased rate of application and air assistance in the boom sprayer.
Highlights
Some years ago, the common bean (Phaseolus vulgaris L.) was considered to be a subsistence crop, but because of the advancements in technology and crop research, it is grown as a cash crop by large scale commercial farmers, (Rinaldi, 2008).White mold is one of the most destructive diseases of common bean in the world, especially when cultivated in areas of mild temperatures and high soil and air moisture
Pesticide rotation is recommended to manage pest resistance
This work aimed to quantify and evaluate the distribution of liquid sprayed on the plant canopy, and analyze the efficiency of fungicide applied by hydraulic spray nozzle with air assistance on white mold control
Summary
The common bean (Phaseolus vulgaris L.) was considered to be a subsistence crop, but because of the advancements in technology and crop research, it is grown as a cash crop by large scale commercial farmers, (Rinaldi, 2008).White mold is one of the most destructive diseases of common bean in the world, especially when cultivated in areas of mild temperatures and high soil and air moisture. In fields with history of white mold, some measures must be taken for an integrated management of pests and diseases. This strategy aims to obtain quality products, reducing and even eliminating the use of pesticides. Chemical control by foliar fungicide application is among the management measures that reduce the effects on the crop, or even prevent the entry of white mold in the field. The authors state that increased deposition of the solution on the target can be achieved by using port nozzles with air assistance. This technique has some restrictions, because it depends on the plant size and wind speed ratio
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