| 单词 | defoliation |
| 例句 | Forestry officials, fearing that another season’s defoliation might result in severe loss of trees, decided to carry out control operations in 1957. Silent Spring 1962-09-27T00:00:00Z “We need your expertise to help with defoliation.” The Last Cuentista 2021-10-12T00:00:00Z Otherwise, when buying greenery or assembled wreaths, inspect the boxwood carefully for any symptoms, namely brown leafspots leading to branch defoliation, and black streaks on stems. Boxwood wreaths are lovely but may carry a deadly disease 2018-12-11T05:00:00Z Although symptoms of the disease are clear and devastating — in the growing season, it is manifest as brown leaf spots, black streaks on stems and defoliation — its presence on holiday greenery may not be evident. An easy, elegant and strangely addictive holiday project: DIY boxwood wreaths 2016-12-09T05:00:00Z Oleander leaf scorch, which can infect olives because they are in the same family as oleanders, can cause leaf yellowing and localized defoliation. Why is this tree losing its leaves? Here are some possibilities 2023-09-06T04:00:00Z It was, writes Black, “the first time the Pentagon had openly acknowledged responsibility for the legacy of Operation Ranch Hand,” the code name for the defoliation campaign. Review | Vietnam’s toxic legacy continues, and Agent Orange looms large 2023-03-23T04:00:00Z The resolution also cites the veterans’ exposure to toxic defoliation chemicals known as Agent Orange used extensively by the U.S. during the war. Lawmakers introduce resolution to give formal apology for treatment of Vietnam vets 2023-02-17T05:00:00Z The total number of egg masses they find helps them predict whether defoliation of more than 50% of the forest canopy is likely. What to do if you see a spongy moth (or its very hungry caterpillars) 2022-10-13T04:00:00Z A: There are at least two possibilities to explain why your maple has defoliation. When to plant hot peppers, how to help sad peonies and tomatoes, and more garden questions 2022-06-07T04:00:00Z “And you get defoliation that spring, and populations are raising havoc for anyone who has them in their yards.” Rash-causing moth spreading due to warming, scientists find 2022-02-26T05:00:00Z Each species that encounters the fungus displays different levels of resistance, but many plants experience deformed leaves, defoliation, stunted growth and even death. Australian plant species face "imminent extinction" from invasive pathogen 2020-06-07T04:00:00Z According to the VA, more than 19 million gallons of various herbicides and defoliation chemicals were used during the war. Lawmakers introduce resolution to give formal apology for treatment of Vietnam vets 2023-02-17T05:00:00Z Fungal defoliation does not raise concerns about aspen mortality unless it occurs over multiple years, West said. Colorado snowpack decreased beetle impact on trees 2020-02-05T05:00:00Z A second, more serious possibility would be a soil disease called verticillium wilt, a fungus that causes defoliation. When to plant hot peppers, how to help sad peonies and tomatoes, and more garden questions 2022-06-07T04:00:00Z The Department of Natural Resources says the invasive pest caused widespread defoliation in the state from the mid-1980s to the early 1990s. Gypsy moth attacks on Michigan trees expected this summer 2019-06-12T04:00:00Z Boxwood blight produces dark brown leaf spots and causes rapid defoliation that sometimes kills young boxwoods. Disease attacking boxwood shrubs confirmed in Detroit area 2018-12-11T05:00:00Z The boxwood cultivar Graham Bland was found to be particularly infested with the blight, which creates dark leaf spots and causes rapid defoliation that sometimes kills young boxwoods. Fungal blight that infects boxwood shrubs found in Indiana 2018-10-16T04:00:00Z Unlike trees, grasses don’t shed their leaves at the end of the growing season; they depend on animals for defoliation and the recycling of nutrients. Can Dirt Save the Earth? 2018-04-18T04:00:00Z The tree’s defoliation initially prompted ridicule and disdain. Rome’s Famous Christmas Tree to Be Reborn as a Baby Nursing Station 2018-01-11T05:00:00Z When humidity is low, your plants are more likely to experience stippled leaves and possible defoliation from a spider-mite infestation. How to keep your tropical houseplants happy and healthy through a chilly, dark winter 2018-01-03T05:00:00Z Aerial footage shows massive defoliation, plus landslides and downed trees. Puerto Rico tourism craters in wake of Hurricane Maria 2017-10-24T04:00:00Z Forest health specialist Roger Mech says trees rarely die from tent caterpillar defoliation unless already weakened by drought or other stresses. Forest tent caterpillars ravaging northern Michigan trees 2017-06-29T04:00:00Z Forest Service, last month noted reports in the spring of larvae and defoliation near Lava Butte and Sisters. Large Pandora moths due to visit Bend next year 2016-07-08T04:00:00Z Farther north in New Hampshire, however, state forestry experts said this month they’ve received reports of high numbers of gypsy moth and forest tent caterpillars, but no defoliation. Gypsy moth caterpillars return to dine on New England trees 2016-07-03T04:00:00Z Dioxins and related compounds that were sprayed during the defoliation of large portions of southern and central Vietnam are still present in soil and waterways of the country’s forest and agricultural areas. The U.S. needs to clean up its toxic legacy in Vietnam 2016-05-27T04:00:00Z Backed by President Bush, Secretary of State Powell then urged an aggressive counter-narcotics strategy, including a Vietnam-style aerial defoliation of parts of rural Afghanistan. How opium defeated America in Afghanistan 2016-02-23T05:00:00Z There had been several suggestions, he said, that probably wouldn’t be pursued, “but defoliation of the forests by low-grade atomic weapons could well be done.” Ted Cruz Is Not Afraid to Lose 2015-03-24T04:00:00Z Some, such as locusts, simply devour all before them; others, e.g. caterpillars, destroy the leaves and bring about all the phenomena of defoliation. Disease in Plants 2012-03-01T03:00:22Z Stafford said he expects this year’s defoliation will be much worse, adding that he’s received reports from the northeastern part of the state of caterpillars feasting on spruce and conifers. Gypsy moth caterpillars return to dine on New England trees 2016-07-03T04:00:00Z Trees might resist the attacks of enemies and the destruction of their leaves for two or three years, but would be destroyed by a few additional seasons of defoliation. Animals of the Past 2011-11-16T03:00:27.497Z This vernal leaf fall makes little show on the forest floor, but it greatly exceeds in number of leaves the autumnal defoliation. Trees Worth Knowing 2011-10-13T02:00:48.357Z "There is some defoliation and some of the beans have been damaged, but right now we are still working to determine the effect on the crop," Anacafe's Nancy Mendez told Reuters. Tropical Storm Agatha kills 96 in Central America 2010-05-31T03:29:00Z Many aphides, etc., puncture the leaves, suck out the sap, and produce deformations and arrest of leaf-surface, as well as actual loss of substance, and when numerous such insects induce all the evils of defoliation. Disease in Plants 2012-03-01T03:00:22Z In Rhode Island, the state’s Department Environmental Management recently issued a public warning about the increased risk of forest fires due to the defoliation. Gypsy moth caterpillars return to dine on New England trees 2016-07-03T04:00:00Z Their labour often results in the complete defoliation of the tree. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Later they destroy, by defoliation, growing plants, and are particularly injurious to seedlings, the roots of which are weakened by having their tops devoured. Asparagus, its culture for home use and for market: a practical treatise on the planting, cultivation, harvesting, marketing, and preserving of asparagus, with notes on its history Therefore, trees deprived of their foliage are liable to perish, and they are injured in proportion to their defoliation. Soil Culture I have seen hordes of beetles gather in these trees in July and August, skeletonizing the leaves until the defoliation reached 40% or more. Northern Nut Growers Association Report of the Proceedings at the 41st Annual Meeting Pleasant Valley, New York, August 28, 29 and 30, 1950 West Virginia makes a similar report, and attributes poor crops to the presence of anthracnose, a fungus disease of the leaves causing early defoliation. Northern Nut Growers Association Report of the Proceedings at the 43rd Annual Meeting Rockport, Indiana, August 25, 26 and 27, 1952 Several leaf spot diseases have attacked the leaves, also causing early defoliation. Northern Nut Growers Association Report of the Proceedings at the Thirty-Seventh Annual Report Wooster, Ohio, September 3, 4, 5, 1946 Some one year old seedlings died outright but older trees only suffered varying degrees of defoliation. Northern Nut Growers Association Report of the Proceedings at the 44th Annual Meeting Rochester, N.Y. August 31 and September 1, 1953 These sucking insects are small in size and may be overlooked until premature defoliation takes place. Northern Nut Growers Association Incorporated 39th Annual Report at Norris, Tenn. September 13-15 1948 You will note the conspicuous defoliation of the vines on the fence rows. Northern Nut Growers Association Report of the Proceedings at the 41st Annual Meeting Pleasant Valley, New York, August 28, 29 and 30, 1950 The notable leaf-disease resistance of the Ohio variety is worthy of the consideration of planters in districts where early defoliation causes poor filling of the nuts. Northern Nut Growers Association Report of the Proceedings at the 43rd Annual Meeting Rockport, Indiana, August 25, 26 and 27, 1952 This and four other kinds of pecans would have borne nuts this year excepting for defoliation. Northern Nut Growers Association Report of the Proceedings at the Fifteenth Annual Meeting New York City, September 3, 4 and 5, 1924 Oddly enough, the American and Japanese chestnuts suffered much less defoliation than the common Allegheny chinkapin, C. pumila. Northern Nut Growers Association Report of the Proceedings at the 44th Annual Meeting Rochester, N.Y. August 31 and September 1, 1953 In a few plantings a condition causing some premature defoliation has been observed at infrequent intervals. Northern Nut Growers Association Incorporated 39th Annual Report at Norris, Tenn. September 13-15 1948 The evidence indicates rather that it attacks trees that are already somewhat weakened by defoliation or other injury. Northern Nut Growers Association Report of the Proceedings at the 41st Annual Meeting Pleasant Valley, New York, August 28, 29 and 30, 1950 Very often this premature defoliation results in the production of a new crop of leaves and some shoot growth. Northern Nut Growers Association Report of the Proceedings at the Thirty-Eighth Annual Meeting Guelph, Ontario, September 3, 4, 5, 1947 Then came a canker worm invasion with partial or complete defoliation of even the forest trees. Northern Nut Growers Association Report of the Proceedings at the Fifteenth Annual Meeting New York City, September 3, 4 and 5, 1924 A husk blight appears to affect Persian walnuts in some places, and nut production is very seriously affected among black walnuts by defoliation prematurely, either because of drought or leaf-spot. Northern Nut Growers Association Thirty-Fourth Annual Report 1943 A leaf spot disease has been observed but has caused no appreciable defoliation and no control measures have been thought necessary. Northern Nut Growers Association Incorporated 39th Annual Report at Norris, Tenn. September 13-15 1948 The aphids were very numerous and unfortunately caused the defoliation of all the currants with the exception of the blacks. Trees, Fruits and Flowers of Minnesota, 1916 Embracing the Transactions of the Minnesota State Horticultural Society,Volume 44, from December 1, 1915, to December 1, 1916, Including the Twelve Numbers of "The Minnesota Horticulturist" for 1916 It even feeds on evergreens, killing the trees by a single defoliation. Studies of Trees The defoliation of deciduous trees is announced by the flowering of the Colchicum; of these the ash is the last that puts forth its leaves, and the first that loses them. The Botanic Garden. Part II. Containing the Loves of the Plants. a Poem. With Philosophical Notes. Shrunken kernels are a logical result of early defoliation. Northern Nut Growers Association Thirty-Fourth Annual Report 1943 This is true under favorable conditions but does not hold under conditions of crowding, low soil fertility, or premature defoliation. Northern Nut Growers Association Incorporated 39th Annual Report at Norris, Tenn. September 13-15 1948 Should the infection be so severe as to cause premature defoliation, the damage will be great even though only a small percentage of the leaves falls. Northern Nut Growers Association Incorporated 39th Annual Report at Norris, Tenn. September 13-15 1948 Several successive defoliations are liable to kill a tree. Studies of Trees Early defoliation appears to be the cause of poor filling in wet seasons. Northern Nut Growers Association Thirty-Fourth Annual Report 1943 |
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