Results 161 to 170 of about 1,292,238 (202)

Estimating the Severity of Defoliation Due to Pine Processionary Moth Using a Combination of Landsat and UAV Imagery

IEEE International Geoscience and Remote Sensing Symposium, 2018
After the recent outbreak of pine processionary moth (Thaumetopoea pityocampa) was observed in 2016, we attempted to estimate the damage severity in Catalonia, Spain.
Kaori Otsu, Magda Pla, L. Brotóns
semanticscholar   +1 more source

Mapping the extent and severity of tree mortality and defoliation caused by spruce budworm using landsat time series

International Journal of Remote Sensing
The spruce budworm is one of the principal defoliators affecting forest health in Canada. Studying the impact of spruce budworm on forests including understanding the extent and severity of tree defoliation and mortality caused by the outbreaks is ...
Xichun Zhou, L. Guindon, Pauline Perbet, O. Reisi Gahrouei, Jean-François Cøté, Kaysandra Waldron, Daniel Kneeshaw, Martin Béland   +7 more
semanticscholar   +1 more source

COIRÓN DULCE (Festuca gracillima Hook, f.) GROWTH PHYSIOLOGY UNDER DIFFERENT DEFOLIATION INTENSITY LEVELS AND WATER RESTRICTION REGIMES

Chilean journal of agricultural & animal sciences
Festuca gracillima Hook, f. is a tussock grass species that grows and dominates the rangelands of the Magellan Region in Chile. It may exhibit tolerance to water restriction, while low defoliation intensity could encourage F. gracillima growth regardless
Paula Oyaneder, I. Ordóñez, S. Radic‐Schilling, Ignacio F. López, J. Ivelic-Sáez   +4 more
semanticscholar   +1 more source

Evaluation of branch sampling, ocular assessments, and aerial surveys for estimating spruce budworm defoliation

Canadian Journal of Forest Research
We compared three methods for estimating current-year spruce budworm (Choristoneura fumiferana Clem.) defoliation from 2014 to 2021 using a network of 99 permanent sample plots in central Gaspé Peninsula, Québec.
Shawn D. Donovan, D. MacLean
semanticscholar   +1 more source

Defoliation Categorization in Soybean with Machine Learning Algorithms and UAV Multispectral Data

Agriculture
Traditional disease severity monitoring is subjective and inefficient. This study employs a Parrot multispectral sensor mounted on an unmanned aerial vehicle (UAV) to apply machine learning algorithms, such as random forest, for categorizing defoliation ...
Marcelo Araújo Junqueira Ferraz, Afrânio Gabriel da Silva Godinho Santiago, A. T. Bruzi, Nelson Júnior Dias Vilela, G. Ferraz   +4 more
semanticscholar   +1 more source

Comparative metabolomics reveals how the severity of predation by the invasive insect Cydalima perspectalis modulates the metabolism re–orchestration of native Buxus sempervirens

Plant biology
The recent biological invasion of box tree moth Cydalima perspectalis on Buxus trees has a major impact on European boxwood stands through severe defoliation. This can hinder further regrowth and threaten survival of populations.
A. Hay, C. Deborde, T. Dussarrat, A. Moing, A. Millery, T. P. T. Hoang, D. Touboul, M. Rey, L. Ledru, S. Ibanez, P. Pétriacq, C. Vanhaverbeke, C. Gallet   +12 more
semanticscholar   +1 more source

Effect of Time and Severity of Defoliation on Growth and Composition of 'Thompson Seedless' Grapes

American Journal of Enology and Viticulture, 1970
9Thompson Seedless9 vines were partially defoliated at 12, 35, and 58 days postanthesis (PA). Vines defoliated 25 and 50% at 12 days PA had respectively 28 and 34% lower crop yields whereas vines defoliated the same amount at the two later times did not ...
W. Kliewer
semanticscholar   +1 more source

Using Plant Growth-Promoting Products to Lessen the Impact of Defoliation in Potatoes

Agronomy
In Alberta, extreme weather events, such as hailstorms, have negative impacts on agriculture. Previous studies have found that potato crop yield and quality losses from hail are dependent on both the severity and the timing of the event. It has also been
Joseph A. St Louis, J. Neilson
semanticscholar   +1 more source

Effect of Time and Severity of Defoliation on Growth of Roots, Trunk, and Shoots of 'Thompson Seedless' Grapevines

American Journal of Enology and Viticulture, 1973
The effect of leaf removal on accumulation of dry matter in grapevine parts was evaluated in a pot experiment on nonfruiting rooted cuttings of Vitis vinifera L., 9Thompson Seedless9.
W. Kliewer, R. Fuller
semanticscholar   +1 more source

Identification of a defoliation severity threshold for changing fruitset, bunch morphology and fruit composition in Pinot Noir

, 2016
D. Acimovic, L. Tozzini, A. Green, P. Sivilotti, P. Sabbatini   +4 more
semanticscholar   +1 more source