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Training Resource for Improvement of Visual Assessment of Field Crop Disease and Insect Defoliation Severity

PhytoFrontiers, 2023
The Field Crop Disease and Insect Defoliation Severity Training Tool is an interactive online resource designed to help crop scouts and researchers to increase visual assessment skills for disease symptom and insect defoliation severity on plant leaves ...
Adam J. Sisson, Daren S. Mueller
doaj   +2 more sources

Relationship among Entomosporium severity, defoliation, and vegetative-reproductive variables in pear in Brazil [PDF]

Pesquisa Agropecuária Brasileira, 2018
: The objective of this work was to evaluate the relationship among Entomosporium severity, defoliation, and vegetative-reproductive variables of three European pear cultivars in Southern Brazil.
Amauri Bogo, Mayra Juline Gonçalves, Rosa Maria Valdebenito Sanhueza, Leo Rufato, Ricardo Trezzi Casa, Betina Pereira de Bem, Fabio Nascimento da Silva   +6 more
doaj   +3 more sources

Estimate of soybean defoliation via digital image processing in software [PDF]

Revista Ciência Agronômica, 2022
This study aimed to develop and validate the digital image processing software to quantify leaf coverage, employing the correlation of defoliation values and NDVI with various gradients of defoliation severity of the Asian soybean rust pathosystem.
Roger Nabeyama Michels, Marcelo Giovanetti Canteri, Marcelo Augusto de Aguiar e Silva, Carlos Alberto Paulinetti da Câmara, Janksyn Bertozzi, Tatiane Cristina Dal Bosco   +5 more
doaj   +2 more sources

Phenolic profile of grapevine cv. Tempranillo skins is affected by timing and severity of early defoliation

Spanish Journal of Agricultural Research, 2021
Aim of study: To investigate the effects of three early leaf removal treatments on the phenolic compounds of cv. ‘Tempranillo’ (Vitis vinifera L.) grape skins.
Daniel Moreno, Diego S. Intrigliolo, Mar Vilanova, Juan R. Castel, Esther Gamero, Esperanza Valdés   +5 more
doaj   +2 more sources

Does the type of silvicultural practice influence spruce budworm defoliation of seedlings?

Ecosphere, 2021
Spruce budworm (Choristoneura fumiferana (Clem)) is the main defoliator in the boreal forest of North America, and its outbreaks have major ecological and economic consequences and represent a challenge for forest management.
Janie Lavoie, Miguel Montoro Girona, Guillaume Grosbois, Hubert Morin   +3 more
doaj   +2 more sources

Effects of Defoliation at Fruit Set on Vine Physiology and Berry Composition in Cabernet Sauvignon Grapevines

Plants, 2021
Grapevine canopy defoliation is a fundamentally important technique for the productivity and quality of grapes. Leaf removal is a pivotal operation on high-density vines which aims to improve air circulation, light exposure, and leaf gas exchange.
Eleonora Cataldo, Linda Salvi, Francesca Paoli, Maddalena Fucile, Giovan Battista Mattii   +4 more
doaj   +2 more sources

Calibrating the Severity of Forest Defoliation by Pine Processionary Moth with Landsat and UAV Imagery

Sensors, 2018
The pine processionary moth (Thaumetopoea pityocampa Dennis and Schiff.), one of the major defoliating insects in Mediterranean forests, has become an increasing threat to the forest health of the region over the past two decades. After a recent outbreak
Kaori Otsu, Magda Pla, Jordi Vayreda, Lluís Brotons   +3 more
doaj   +2 more sources

The effect of defoliation on the 3-isobutyl-2-methoxypyrazine biosynthesis in wine grapes

Horticultural Science, 2022
Field studies were conducted on Vitis vinifera cv. 'Cabernet Sauvignon' to evaluate the effects of the defoliation time (pre- and post-flowering and veraison) and severity on the 3-isobutyl-2-methoxypyrazine (IBMP) concentration and expression levels of ...
Yujuan Lei, Zhansheng Ma, Pengbao Shi, Yuxia Sun, Ping Wang, Xueqiang Guan   +5 more
doaj   +2 more sources

Reconstructing spruce budworm outbreak severity: a comparison of paleoecological and tree-ring signals. [PDF]

PLoS One
Applying a centennial or millennial perspective to disturbance regimes permits an understanding of how these events have varied in the past in relation to climate change.
Leclerc MA, Simard M, Morin H.
europepmc   +2 more sources

Quantifying the severity of Marssonina blotch on apple leaves: development and validation of a novel spectral index. [PDF]

Plant Methods
Apple Marssonina blotch (AMB) is a major disease causing pre-mature defoliation. The occurrence of AMB will lead to serious production decline and economic losses.
Zhang W, Zhang C, Chen R, Xu B, Yang H, Feng H, Zhao D, Wu B, Zhao C, Yang G.   +9 more
europepmc   +2 more sources