Early detection and yield assessment on anthracnose-twister disease of garlic (Allium sativum L.) using GIS and Remote Sesing Technology in Pantabangan, Nueva Ecija [manuscript]
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Date
2019
Authors
Rommel Karlo R. Dela Cruz
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Abstract
The study was conducted to detect andmonitor Anthracnose-twister disease of garlic in the Province of Nueva Ecija with the use of Geographic Information System (GIS) and Remote Sesing Technology. Seven (7) Barangays of the Municipality of Pantabangan were identified as garlic growing sites. The surveillance started from January 2019 to April 2019. Garlic production areas were tracked using a handheld GPS while garlic twisted infected sites were assessed for disease incidence and severity for the processing of geo-phytopathological maps.
The spectral measurement was proven to be effective in determining the twister infected garlic. Differences in the indices showed that highly infected leaves provide the highest reflectance while the healthy leaves produce the lowest reflectance due to the high presence of chlorophyll to absorb the radiance from the sunlight.
Unmanned Aerial Vehicle (UAV) and Satellite images were also used in the study to produce geo-phytopatholocal maps. Image results showed that the quality of UAV acquired images are more applicable to use in small fields such as garlic areas observed in the study. The access to higher quality images are one of the advantages of the UAV over satellite acquired images in lower altitudes. However, the use of UAV in risky places such as near cliffs and near bodies of water are found to be one of the limiting factors of the usage of UAV.
Yield data showed an estimated average of 3.75 MT per hectare of garlic was produced in the Municipality. Results shows that the highly infected garlic areas produced lesser yield compared to areas that shows no incidence of the disease.
The use of GIS and remote sensing techniques in the early growth stages of the garlicv to monitor and detect garlic twister disease has been successful in this study. GEnerated GIS maps revealed that the twister disease of garlic caused damage of 35.53% of the total garlic producing areas surveyed. The results showed that the disease aggravates if the area is located near a bodies of water and a hill giving a favorable environment for the disease due to the increase of rainfall in December 2018 to January 2019. Furthermore, fertilizer mismanagement and weeding problem at the early stages has also been observed to worsen the damage of the disease causing yield loss.