Ag Data Commons
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The Cause of Increased Effectiveness of Water-In-Oil Emulsion over Water Application of Trichoderma ovalisporum on Therobroma cacao Pods

posted on 2023-12-18, 17:48 authored by Ronald T. Collins, Mary Camp, Bryan Bailey, Lyndel Meinhardt

Previous research conducted in Costa Rica determined that Trichoderma ovalisporum, when applied in a water-in-oil emulsion to Theobroma cacao pods, had less Moniliophthora roreri (frosty pod rot) than in water. The current research was conducted to determine why bio-control agents when applied to cacao pods were more effective in a water-in-oil emulsion than water for controlling frosty pod rot. The experiments were conducted in Ecuador in 2011 and 2012. Two formulations were used: water-in-oil emulsion and water. Water-sensitive cards were attached to the lower branches of the cacao trees. There were four trees per treatment and six cards per tree. One hundred and eighty ml of formulation were applied to each tree with a Stihl SR 420 backpack mist-blower. The cards underwent droplet analysis with the DepositScan software package. Droplet analysis determined that the increased efficacy of water-in-oil emulsion was the result of the micro-environment advantage of the water-in-oil emulsion.

Resources in this dataset:

  • Resource Title: Rc139MetaData.

    File Name:

    Resource Description: RC139MetaData is composed of five files. (1) RC139Readme: is a description of the files in the (2) RC139CodeBook: Is a description of the experiment, how it was conducted, what variables are in the RC139Data with their description. (3) & (5) SAS satistical program code for analysis of RC139data. (5) RC139Data: Dataset containing results of experiments.

  • Resource Title: RC139 Data Dictionary.

    File Name: RC139-data-dictionary.csv

    Resource Description: Defines variables, origination, data type, etc. for each column in RC139Data.csv data. (NOTE: Also contained in the markdown Code book file within the


USDA-ARS: 8042-21000-278-00D


Data contact name

Collins, Ron

Data contact email


Ag Data Commons

Intended use

The purpose of this research is to assist growers in increasing the efficiency of application of bio-control agents with backpack mist-blowers in controlling diseases.

Temporal Extent Start Date


Temporal Extent End Date



  • Not specified

Geographic Coverage


Geographic location - description


ISO Topic Category

  • farming

National Agricultural Library Thesaurus terms

Costa Rica; emulsions; pod rot; cocoa pods; Ecuador; branches; Theobroma cacao; trees; droplets; computer software; fungal diseases of plants; biological control; biological control agents

OMB Bureau Code

  • 005:18 - Agricultural Research Service

OMB Program Code

  • 005:040 - National Research

ARS National Program Number

  • 303

Pending citation

  • No

Public Access Level

  • Public

Preferred dataset citation

Collins, Ronald T.; Camp, Mary; Bailey, Bryan; Meinhardt, Lyndel (2018). The Cause of Increased Effectiveness of Water-In-Oil Emulsion over Water Application of Trichoderma ovalisporum on Therobroma cacao Pods. Ag Data Commons.