共查询到20条相似文献，搜索用时 125 毫秒
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枸杞是１种多年生观果类小灌木 ,其果枸杞子可入药 ,并具有较高的营养价值 ,但在栽培中较易发生瘿螨 ,影响产量和观赏价值。我校标本园种植的２０棵枸杞 ,枸杞瘿螨危害普遍 ,被害率１００%,且危害严重 ,萌芽开始危害 ,将展叶就可见到螨瘿 ,严重时几乎叶叶有螨瘿。１枸杞瘿螨的形态特征枸杞瘿螨（ＥｒｉｏｐｈｙｅｓｐａｒａｗａｇｎｏｎｉＫａａｕｇ）也叫痣志、虫包子。属蛛形纲、蜱螨目、瘿螨科。成螨、若螨、卵都在螨瘿内。１ .１成螨体长０.１８ｍｍ ,橙黄色 ,体圆锥形 ,足２对 ,爪钩复羽状 ,口器向前下方斜伸 ,胸部背刚毛２对 ,体侧有… 相似文献
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《林业实用技术》2021,(9)
通过测量虫瘿长径、短径、厚度和质量,统计虫瘿内瘿螨(Aceria pallida keifer)数量,分析黑果枸杞(Lycium rathenicum Murr)瘿螨虫瘿与螨量的关系,以期建立虫瘿大小与瘿内螨量关系的数学模型,为科学防治瘿螨危害提供理论依据。结果表明:虫瘿长径在2.1～3.0 mm区间、短径在1.1～2.0 mm区间、厚度在1.6～2.0 mm区间时瘿螨的数量最多。虫瘿的长径、短径、厚度和质量与瘿内螨量均呈显著正相关关系,其中质量与瘿内螨量高度相关。虫瘿质量与瘿内螨量关系的回归方程y=13.86x+8.23,可作为估算瘿内螨量的模型。 相似文献
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枣树锈瘿螨对枣树几项生理指标的影响 总被引：3，自引：0，他引：3
枣树锈瘿螨对枣树几项生理指标的影响季延平仝德全侯玉芹杜华兵（山东省林科所，２５００１４）刘爱兴李榜庆崔广华（乐陵市林业局）枣树锈瘿螨（ＥｐｉｔｒｉｍｅｒｕｓｚｉｚｙｐｈａｇｎｓＫｅｉｆｅｒ．）又称枣树锈壁虱，隶属蜱螨目、瘿螨科。该害螨在山东、河北、河... 相似文献
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木樨瘤瘿螨Acenis osmanthis Kuang为害桂花,一年发生2～3,代以成螨在虫瘿内越冬,翌年3月下旬至4月初,从老叶爬出侵害幼叶。每头雌螨一般产卵5～7粒于瘿内。夏季高温,该螨呈蛰伏状态。秋天有部分瘿螨从瘿内爬出,但未见为害秋梢或别的越冬场所。桂花不同品种间受害程度差异明显,地势背阴、郁闭的桂花园和苗圃受害重。 相似文献
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A major problem for small farmers in the semi-arid tropics is the chronic shortage of fodder for draft animals. Leucaena leucocephala has improved productivity in many places in India and in various cropping systems, usually as either a pure crop or in a
hedgerow alley-cropping configuration. Mixed cropping with arboreal forms is seldom seen. For off-season fodder production,
hedgerows have the disadvantage of being open to unmanaged browsing when unfenced (as is usual). Arboreal forms are generally
far less vulnerable.
In this paper, the components of production of sorghum and arboreal Leucaena are measured under different intensities of canopy lopping. The most productive management system of those examined was pollarding
of the Leucaena at the time of under-sowing with sorghum. In a year with less than 50% of average seasonal rainfall, this system gave a yield
of 4.6 tonnes/ha/yr fresh wt fodder and 3.8 tonnes/ha/yr dry wt. of fuel harvests, while increasing the standing crop of wood
by 1.8 t/ha/yr and retaining a yield of sorghum grain equivalent to 46% of pure sorghum cropping; the LER of this system was
1.35.
Cash values of the alternative management systems were estimated, including the discounted Net Present Value of the standing
crop of timber. Maximum value was attained with unlopped pure crop Leucaena followed by pollarded Leucaena with sorghum; pure crop sorghum achieved a lower value.
These results demonstrate both the high productivity of Leucaena/sorghum based systems, and the stability of production even in poor rainfall conditions. Pollarding transferred the high
future value of Leucaena timber to the present value of sorghum grain and fuelwood. 相似文献
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Srisuda Thippayarugs Banyong Toomsan Patma Vityakon Viriya Limpinuntana Aran Patanothai Georg Cadisch 《Agroforestry Systems》2008,72(2):137-148
In situ produced plant residues contain a mixture of different plant components of varying quality. To assess synergistic
or antagonistic interactions occurring during the decomposition and mineralization of such mixtures, individual plant parts
(stems, leaves, leaf litter and roots) or the mixture of stems, leaves and leaf litter of the agroforestry species pigeonpea
(Cajanus cajan) or of crop residues of peanut (Arachis hypogaea) or of the weed hairy indigo (Indigofera hirsuta) were incubated in pots for 19 weeks. Periodically, remaining plant residues were sieved out (>2 mm), weighed and N content
as well as soil mineral N determined. Above- and below-ground residues of peanut decomposed fastest and showed the largest
N release in agreement with their high N concentration and low-acid detergent fibre (ADF) : N ratio. Hairy indigo was hypothesized
to be of lower quality than pigeonpea because of its high-polyphenol content. However, it decomposed faster than pigeonpea,
largely because of the higher N and lower lignin concentration of its components. Ranking of individual plant components for
N mineralization resulted in the following pattern, leaves > leaf litter > roots > stems. In mixtures of the different plant
components a similar species order in decomposition was obtained, e.g. peanut > hairy indigo > pigeonpea. The amount of N
released from the mixture was dominated by stem material that comprised 46–61% of the mixture. The interactions in mixtures
were relatively small for peanut (generally high-quality components) as well as for pigeonpea (low proportion of high-quality
components, i.e. N rich leaf material). However, a positive interaction occurred during later stages of N mineralization in
the mixture of hairy indigo as it had a significant proportion of N rich components and absence of highly reactive polyphenols.
Thus, for plants with low to intermediate chemical quality attributes, manipulating plant composition (e.g. by varying harvest
age, affecting stem and leaf proportions) will be important to obtain significant interactions during decomposition when its
components are mixed. 相似文献
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The olive psyllid, Euphyllura phillyreae Foerster is one of the most destructive pests on buds and flowers of olive tree (Olea europaea L.) in May when the olive growers cannot apply any insecticides against the pest. Temperature-dependent development of the
psyllid was studied at constant temperatures ranged 16–26°C. A degree-day (DD) model was developed to predict the larval emergence
using the weekly cumulative larval counts and daily mean temperatures. Linear regression analysis estimated a lower developmental
threshold of 4.1 and 4.3°C and a thermal constant of 164.17 and 466.13 DD for development of egg and larva, respectively.
The cumulative larval counts of E. phillyreae approximated by probit transformation were plotted against time, expressed as the sum of DD above 4.3°C, the starting date
when the olive tree phenology was the period of flower cluster initiation. A linear model was used to describe the relationship
of DDs and probit values of larval emergence patterns of E. phillyreae and predicted that 10, 50 and 95% emergence of the larvae required 235.81, 360.22 and 519.93 DD, respectively, with errors
of 1–3 days compared to observed values. Based on biofix depends the development of olive tree phenology; the DD model can
be used as a forecasting method for proper timing of insecticide applications against E. phillyreae larvae in olive groves. 相似文献
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竹类是一类具特殊生长习性与生长型的植物,其分布范围广泛、有性生殖脆弱而无性繁殖发达,易于受到人为和自然因素的影响而沦为小种群或濒危物种。本文从小种群近交危害与集合种群上分析了竹类种质保护的适度思想,即适宜的局域种群与集合种群结构度是优化竹类野生种质保护的重要依据;并从区域相对封闭生态系统结构度与竹类种质稳定性上分析了野生种质适度保护的策略;最后从加强竹类种质种群生态学特征的编目清查、自然野生栖息地就地保护、竹类种质保存圃建立与完善,以及竹类原料林的定向培育4方面阐述了竹类种质的适度保护体系。 相似文献
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Eugenol and thymol, alone or in combination, induce morphological alterations in the envelope of Candida albicans 总被引：1，自引：0，他引：1
The envelope of Candida albicans, with its outermost array of macromolecules protruding towards the environment, is pivotal to the expression of major virulence factors such as adhesiveness, and the morphological transition to hyphal form. We tested the anticandidal activity of eugenol, main component of clove oil, and thymol, main component of thyme oil, alone or in combination, by investigating their ability to interfere with the architecture of the envelope of C. albicans. Both molecules alterated the morphogenesis of the envelope, but the effects of thymol were more pronounced than those of eugenol. Certain combinations of the two molecules led to a synergistic effect, which is interesting in the view of potentiating their inhibition of C. albicans colonisation and infectiousness. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1):53-61
This study investigated the stand structure in pine, spruce and deciduous forests in the border district of Finland and Russia. A total of 46 mature forest stands was selected as pairs, the members of each pair being as similar as possible with respect to their forest site type, age, moisture and topography. The stands were then compared between the two countries by means of basal areas and number of stems. The proportions of dominating tree species were 2-12% lower, and correspondingly the proportions of secondary tree species higher, in Russian forests. The density of the forest stock was also higher in each forest type in Russia. The forests in the two countries differed most radically in terms of the abundance of dead trees. The amount was two to four times higher in Russian deciduous and spruce forests, and in pine forests the difference was 10-fold. The stand structures indicated that Russian coniferous stands, in particular, were more heterogeneous than intensively managed pine and spruce stands in Finland. 相似文献
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Marcelo de Carvalho Alves Fábio Moreira da Silva Edson Ampélio Pozza Marcelo Silva de Oliveira 《Journal of pest science》2009,82(2):137-148
The advent of Precision Agriculture has made possible the analysis of complex spatial patterns of plant disease epidemiology
considering statements of integrated disease management. The objective of this work was to use geostatistics, statistics and
geographical information systems to characterize the structure and magnitude of spatial dependency of rust (Hemileia vastatrix) and brown eye spot (Cercospora coffeicola) incidence and severity in coffee agroecosystem cultivated with Catuai Vermelho IAC-99 (Coffea arabica L.). Evaluations of incidence and severity of rust and brown eye spot were accomplished at 67 georeferenced points arranged
in 6.6202 ha of coffee crop, in the years of 2005, 2006 and 2007. Exponential models of covariance enabled the characterization
of the magnitude and structure of rust and brown eye spot spatial variability in the evaluated dates. Ordinary block kriging
presented satisfactory performance to map rust and brown eye spot outbreaks based on kriging error coefficients. Kriged maps
enabled the visualization of intensity of rust and brown eye spot in each evaluation date. Assessments of incidence and severity
presented highly statistical correlation based on linear regression models, also confirmed by the spatial variability of kriging
maps. Kriging maps of rust and brown eye spot enabled to observe that intensity of disease was dispersed in foci patterns
along the coffee plantation, indicating that the current strategy of disease control based in total area may be replaced by
site specific disease management, with less environmental impact and sustainability of coffee crop, according to statements
of integrated disease management and precision agriculture. 相似文献
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稀酸协同D72树脂固定床催化莰烯水合反应 总被引：3，自引：0，他引：3
采用浓度为０．２％、０．５％、０．８％Ｈ２ＳＯ４及５％、１０％Ｈ３ＰＯ４协同Ｄ７２阳离子交换树脂固定床连续循环催化莰烯水合反应，反应２０ｈ，莰烯转化率９８％，异龙脑含量高达９３％，水合莰烯含量为１．２％． 相似文献