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排序方式: 共有195条查询结果,搜索用时 15 毫秒
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为了筛选适于草坪害虫斜纹夜蛾(Prodenia litura)防治的绿色农药,采用浸叶法测定比较了5个不同化学类别共20种绿色杀虫剂对斜纹夜蛾3龄幼虫的室内活性。结果表明,7种常用农用拟除虫菊酯类杀虫剂的杀虫效果不及常规有机磷农药毒死蜱,而2种新型拟除虫菊酯四氟醚菊酯和四氟苯菊酯的杀虫效果相当或优于毒死蜱;苯甲酰脲类药剂虱螨脲、氟啶脲和氟铃脲,双酰肼类虫酰肼,杂环类茚虫威和虫螨腈,以及生物源类杀虫剂甲氨基阿维菌素苯甲酸盐7种药剂对斜纹夜蛾的活性高,均符合绿色无公害农药的基本要求,是值得进一步试验开发用于草坪斜纹夜蛾等夜蛾类害虫防治的候选药剂。 相似文献
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Martice E Vasquez Amrith S Gunasekara Thomas M Cahill Ronald S Tjeerdema 《Pest management science》2010,66(1):28-34
BACKGROUND: The pyrethroid insecticide etofenprox is of current interest to rice farmers in the Sacramento Valley owing to its effectiveness against the rice water weevil, Lissorhoptrus oryzophilus Kuschel. This study aimed to describe the partitioning of etofenprox under simulated rice field conditions by determining its Henry's law constant (H) (an estimate of volatilization) and organic carbon‐normalized soil–water distribution coefficient (Koc) at representative field temperatures. A comparison of etofenprox and λ‐cyhalothrin is presented using a level‐1 fugacity model. RESULTS: Experimental determination of H revealed that etofenprox partitioned onto the apparatus walls and did not significantly volatilize; the maximum value of H was estimated to be 6.81 × 10?1 Pa m3 mol?1 at 25 °C, based on its air and water method detection limits. Calculated values for H ranged from 5.6 × 10?3 Pa m3 mol?1 at 5 °C to 2.9 × 10?1 Pa m3 mol?1 at 40 °C, based on estimated solubility and vapor pressure values at various temperatures. Log Koc values (at 25 °C) were experimentally determined to be 6.0 and 6.4 for Princeton and Richvale rice field soils, respectively, and were very similar to the values for other pyrethroids. Finally, temperature appears to have little influence on etofenprox sorption, as the log Koc for the Princeton soil at 35 °C was 6.1. CONCLUSION: High sorption coefficients and relatively insignificant desorption and volatilization of etofenprox suggest that its insolubility drives it to partition from water by sorbing to soils with high affinity. Offsite movement is unlikely unless transported in a bound state on suspended sediments. Copyright © 2009 Society of Chemical Industry 相似文献
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BACKGROUND: Honey bees (Apis mellifera L.) are among the most important pollinators in natural and agricultural settings. They commonly encounter insecticides, and the effects of insecticides on honey bees have been frequently noted. It has been suggested that honey bees may be (as a species) uniquely sensitive to insecticides, although no comparative toxicology study has been undertaken to examine this claim. An extensive literature review was conducted, using data in which adult insects were topically treated with insecticides. The goal of this review was to summarize insecticide toxicity data between A. mellifera and other insects to determine the relative sensitivity of honey bees to insecticides. RESULTS: It was found that, in general, honey bees were no more sensitive than other insect species across the 62 insecticides examined. In addition, honey bees were not more sensitive to any of the six classes of insecticides (carbamates, nicotinoids, organochlorines, organophosphates, pyrethroids and miscellaneous) examined. CONCLUSIONS: While honey bees can be sensitive to individual insecticides, they are not a highly sensitive species to insecticides overall, or even to specific classes of insecticides. However, all pesticides should be used in a way that minimizes honey bee exposure, so as to minimize possible declines in the number of bees and/or honey contamination. Copyright © 2010 Society of Chemical Industry 相似文献
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Hilliary E Hodgdon Kyong Sup Yoon Domenic J Previte Hyo Jeong Kim Gamal E Aboelghar Si Hyeock Lee J Marshall Clark 《Pest management science》2010,66(9):1031-1040
BACKGROUND: Pediculosis is the most prevalent parasitic infestation of humans. Resistance to pyrethrin‐ and pyrethroid‐based pediculicides is due to knockdown (kdr)‐type point mutations in the voltage‐sensitive sodium channel α‐subunit gene. Early detection of resistance is crucial for the selection of effective management strategies. RESULTS: Kdr allele frequencies of lice from 14 countries were determined using the serial invasive signal amplification reaction. Lice collected from Uruguay, the United Kingdom and Australia had kdr allele frequencies of 100%, while lice from Ecuador, Papua New Guinea, South Korea and Thailand had kdr allele frequencies of 0%. The remaining seven countries investigated, including seven US populations, two Argentinian populations and populations from Brazil, Denmark, Czech Republic, Egypt and Israel, displayed variable kdr allele frequencies, ranging from 11 to 97%. CONCLUSION: The newly developed and validated SISAR method is suitable for accurate monitoring of kdr allele frequencies in head lice. Proactive management is needed where kdr‐type resistance is not yet saturated. Based on sodium channel insensitivity and its occurrence in louse populations resistant to pyrethrin‐ and pyrethroid‐based pediculicides, the T917I mutation appears to be a key marker for resistance. Results from the Egyptian population, however, indicate that phenotypic resistance of lice with single or double mutations (M815I and/or L920F) should also be determined. Copyright © 2010 Society of Chemical Industry 相似文献
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Bielza P Quinto V Fernández E Grávalos C Abellán J Cifuentes D 《Pest management science》2008,64(5):584-588
BACKGROUND: The western flower thrips (WFT), Frankliniella occidentalis (Pergande), is an economically important pest. The genetic basis of acrinathrin resistance was investigated in WFT. RESULTS: The resistant strain, selected in the laboratory for acrinathrin resistance from a pool of thrips populations collected in Almeria (south-eastern Spain), showed a high resistance to acrinathrin (43-fold based on LC(50) values) compared with the laboratory susceptible strain. Mortality data from reciprocal crosses of resistant and susceptible thrips indicated that resistance was autosomal and not influenced by maternal effects. Analysis of probit lines from the parental strains and reciprocal crosses showed that resistance was expressed as a codominant trait. To determine the number of genes involved, a direct test of monogenic inheritance based on the backcrosses suggested that resistance to acrinathrin was probably controlled by one locus. Another approach, which was based on phenotypic variances, showed n(E), or the minimum number of freely segregating genetic factors for the resistant strain, to be 0.79. CONCLUSION: The results showed that acrinathrin resistance in WFT was autosomal and not influenced by maternal effects, and was expressed as a codominant trait, probably controlled by one locus. 相似文献
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化学防治是草原蝗虫防治的主要应急措施,亚洲小车蝗是内蒙古草原的优势种。采用点滴法测定了4种菊酯类杀虫剂联苯菊酯、高效氯氰菊酯、高效氯氟氰菊酯和甲氰菊酯对亚洲小车蝗3龄蝗蝻的毒力。结果表明,联苯菊酯对亚洲小车蝗3龄蝗蝻的毒力最强,LD50值为0.004 8 μg/头,高效氯氟氰菊酯、高效氯氰菊酯和甲氰菊酯的LD50值分别为:0.022 7、0.012 2和0.005 1 μg/头。同时明确了4种菊酯类杀虫剂对亚洲小车蝗3龄蝗蝻离体ATPase活性都有一定程度的抑制作用。当药剂浓度为1×10-4mol/L时,高效氯氟氰菊酯、高效氯氰菊酯、联苯菊酯和甲氰菊酯对Na+-K+-ATPase的抑制分别为:57.62%、55.34%、45.70%和20.94%,对Ca2+-Mg2+-ATPase的抑制分别为:58.30%、58.05%、41.80%和19.35%。在浓度范围为1×10-4~1×10-8 mol/L,4种杀虫剂对亚洲小车蝗ATPase活性的抑制存在明显的剂量效应关系。 相似文献