scholarly journals Quantifying Citrus Tree Health Using True Color UAV Images

2020 ◽  
Vol 12 (1) ◽  
pp. 170 ◽  
Author(s):  
Blanca N. Garza ◽  
Veronica Ancona ◽  
Juan Enciso ◽  
Humberto L. Perotto-Baldivieso ◽  
Madhurababu Kunta ◽  
...  
Keyword(s):  
Root Rot ◽  
Field Measurements ◽  
Foot Rot ◽  
Citrus Tree ◽  
Tree Health ◽  
Citrus Production ◽  
Rot Disease ◽  
Uav Images ◽  
True Color ◽  
Leaf Greenness

Huanglongbing (HLB) and Phytophthora foot and root rot are diseases that affect citrus production and profitability. The symptoms and physiological changes associated with these diseases are diagnosed through expensive and time-consuming field measurements. Unmanned aerial vehicles (UAVs) using red/green/blue (RGB, true color) imaging, may be an economic alternative to diagnose diseases. A methodology using a UAV with a RGB camera was developed to assess citrus health. The UAV was flown in April 2018 on a grapefruit field infected with HLB and foot rot. Ten trees were selected for each of the following disease classifications: (HLB-, foot rot–), (HLB+, foot rot–), (HLB-, foot rot+) (HLB+, foot rot+). Triangular greenness index (TGI) images were correlated with field measurements such as tree nutritional status, leaf area, SPAD (leaf greenness), foot rot disease severity and HLB. It was found that 61% of the TGI differences could be explained by Na, Fe, foot rot, Ca, and K. This study shows that diseased citrus trees can be monitored using UAVs equipped with RGB cameras, and that TGI can be used to explain subtle differences in tree health caused by multiple diseases.

Integrated management of root rot and foot rot disease of durian

2017 ◽  
pp. 143-146 ◽  
Author(s):  
M. Chuebandit ◽  
S. Vorakuldumrongchai ◽  
W. Prasert
Keyword(s):  
Root Rot ◽  
Integrated Management ◽  
Foot Rot ◽  
Rot Disease

STUDIES ON FOOT AND ROOT ROT OF WHEAT: V. THE RELATION OF PHOSPHORUS, POTASSIUM, NITROGEN, AND CALCIUM NUTRITION TO THE FOOT- AND ROOT-ROT DISEASE OF WHEAT CAUSED BY HELMINTHOSPORIUM SATIVUM P. K. & B.

1938 ◽  
Vol 16c (3) ◽  
pp. 125-134
Author(s):  
W. C. Broadfoot ◽  
L. E. Tyner
Keyword(s):  
Nutrient Solution ◽  
Root Rot ◽  
Ionic Concentration ◽  
Foot Rot ◽  
Wheat Grains ◽  
Root Rot Disease ◽  
Helminthosporium Sativum ◽  
Rot Disease ◽  
Aseptic Conditions ◽  
Complete Nutrient Solution

The effect of different amounts of phosphorus, potassium, nitrogen, and calcium upon the development of the foot-rot disease of wheat caused by Helminthosporium sativum P. K. & B. was studied in the greenhouse. The wheat grains were planted in sterilized pure quartz sand to which the necessary nutrients and spore suspension of the pathogen were added. The experiments were maintained under aseptic conditions during the first ten days. The disease increased when the ionic concentration of potassium, nitrogen, and calcium was decreased below that of the complete nutrient solution, but no significant reduction of the disease was observed when the concentrations of all of the elements, including phosphorus, were increased above those in the complete nutrient solution. Apparently extremely small concentrations of phosphorus had no effect on the disease one way or the other. These conclusions apply to the disease on the seedling stage of wheat.

scholarly journals FIELD EVALUATION OF FACTORS CONTRIBUTING TO STRAWBERRY BLACK ROOT ROT DISEASE

HortScience ◽  
1994 ◽  
Vol 29 (4) ◽  
pp. 245e-245
Author(s):  
Katherine B. Wing ◽  
Marvin P. Pritts
Keyword(s):  
Soil Texture ◽  
Root Rot ◽  
Soil Compaction ◽  
Cultural Practices ◽  
Field Measurements ◽  
Field Evaluation ◽  
Black Root Rot ◽  
Root Rot Disease ◽  
Rot Disease ◽  
Root Health

Black root rot is a devastating, poorly understood disease complex affecting strawberries in temperate regions. The objective of the study was to conduct a comprehensive field survey of environmental, cultural, and pathological factors contributing to black root rot disease of strawberries as it occurs in New York. In Spring 1992, growers were visited to collect information on cultural practices, field measurements, and plant and soil samples from healthy and infected fields. Plants were scored for root health and measurements were made for nematode densities, soil compaction, soil texture, soil nutrients, and plant dry weights. Variables significantly correlated with poor root health were soil compaction, fine soil texture, absence of raised beds, high rates of terbacil (Sinbar) use, advanced age of planting, and many cumulative years of strawberry culture.

Field Measurements and Simulation of Nitrogen Fate under Citrus Production

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 498c-498
Author(s):  
A. Fares ◽  
A.K. Alva ◽  
S. Paramasivam
Keyword(s):  
Mass Balance ◽  
Best Management Practices ◽  
Rainy Season ◽  
Crop Production ◽  
Management Practices ◽  
Root Zone ◽  
Field Measurements ◽  
Irrigation Scheduling ◽  
N Leaching ◽  
Citrus Production

Water and nitrogen (N) are important inputs for most crop production. The main objectives of nitrogen best management practices (NBMP) are to improve N and water management to maximize the uptake efficiency and minimize the leaching losses. This require a complete understanding of fate of N and water mass balance within and below the root zone of the crop in question. The fate of nitrogen applied for citrus production in sandy soils (>95% sand) was simulated using a mathematical model LEACHM (Leaching Estimation And Chemistry Model). Nitrogen removal in harvested fruits and storage in the tree accounted the major portion of the applied N. Nitrogen volatilization mainly as ammonia and N leaching below the root zone were the next two major components of the N mass balance. A proper irrigation scheduling based on continuous monitoring of the soil water content in the rooting was used as a part of the NBMP. More than 50% of the total annual leached water below the root zone was predicted to occur in the the rainy season. Since this would contribute to nitrate leaching, it is recomended to avoid N application during the rainy season.

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