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1.
采用0.15%噻虫嗪药肥混剂对甘蔗害虫进行防效试验。结果显示:0.15%噻虫嗪药肥在甘蔗新种时,直接撒施于甘蔗植沟中,对甘蔗螟虫和蓟马均有较好的防治效果,用于防治螟虫时使用剂量与防治效果之间存在正相关,即防治效果随使用剂量的增加而提高,而用于防治蓟马时不同的使用剂量防效差异不大。0.15%噻虫嗪药肥在甘蔗上推荐用量为600~900 ai g/ha。  相似文献   

2.
本文采用高效液相色谱法,以乙腈+磷酸溶液为流动相,使用以ZORBAX SB-C18、5μm为填料的不锈钢柱和二极管阵列检测器,在260nm波长下对氟噻唑吡乙酮10%可分散油悬浮剂进行分离和定量分析。结果表明,该分析方法的线性相关系数为0.999 1,标准偏差为0.15,变异系数为1.51%,平均回收率为100.18%。  相似文献   

3.
苯并烯氟菌唑原药高效液相色谱分析方法研究   总被引:1,自引:0,他引:1  
本文采用高效液相色谱法,以乙腈+磷酸溶液为流动相,使用以ZORBAX SB-C18、5μm为填料的不锈钢柱和二极管阵列检测器,在255nm波长下对苯并烯氟菌唑原药进行分离和定量分析。结果表明,该分析方法的线性相关系数为0.999 8,标准偏差为0.14,变异系数为0.15%,平均回收率为98.95%。  相似文献   

4.
本文采用高效液相色谱法,以C18柱为固定相,甲醇 水为流动相,用225nm紫外检测器定量测定哒嗪硫磷、辛硫磷混剂的含量。本方法的标准偏差分别为0.01581、0.01517;变异系数分别为0.15%、0.07%;平均回收率分别为99.77%、99.97%;线性相关系数分别为0.9980、0.9979。  相似文献   

5.
本文采用高效液相色谱法,以甲醇+水为流动相,使用ZORBAX80觷A Extend-C18、5μm为填料的不锈钢柱和二极管阵列检测器,在222nm波长下对试样中的种菌唑进行分离和定量分析。结果表明,该方法测得种菌唑的线性相关系数为0.999 8;标准偏差为0.14;变异系数为0.15%;平均回收率为99.87%。  相似文献   

6.
本文介绍了以甲醇 水为流动相,采用C18不锈钢柱,230nm检测波长,对混剂中稻瘟灵和异稻瘟净进行液相色谱定量分析的方法.该方法稻瘟灵和异稻瘟净的标准偏差分别为0.05、0.03,变异系数分别为0.25%、0.15%,线性相关系数分别为0.999 9、0.9999,平均回收率分别为99.5%、99.8%.  相似文献   

7.
论述了以邻苯二甲酸二乙酯为内标物,用HP-5色谱柱,氢火焰检测器,内标法定量气相色谱测定异恶草酮的方法。方法标准偏差为0.07,变异系数0.15%,回收率在99.3%-100.7%之间。  相似文献   

8.
以青花菜为试材,采用大田和室内分析相结合的试验方法,研究了0.15 mmol·L-1的水杨酸(SA)对不同灌水下限(相对含水量75%,60%和45%)青花菜根系生长及叶片抗氧化特性的影响。结果表明:(1)随着灌水下限的降低,青花菜主根长、根干鲜重及过氧化氢酶(CAT)活性先升高后降低,根冠比、过氧化氢(H2O2)含量、超氧化物歧化酶(SOD)、过氧化物酶(POD)及抗坏血酸过氧化物酶(APX)活性逐渐升高。(2)SA处理改善了青花菜根系生长特性,降低根冠比,提高结球期抗氧化酶活性,其中60%灌水下限经SA处理后,根系及酶活性指标均与75%灌水下限保持相当水平。由此可知:以相对含水量60%作为灌水下限并配合0.15 mmol·L-1SA处理可以为青花菜高效节水灌溉提供理论支撑。  相似文献   

9.
在室内条件下,以2个亚致死浓度(0.15和0.30mg/L)喷雾处理烟粉虱1、5日龄卵,明确了印楝素亚致死浓度对烟粉虱实验种群发育、存活、繁殖均具有显著的抑制作用。其中,印楝素处理1日和5日龄卵分别使幼期(卵至成虫羽化)发育历期延长0.92至2.84d,幼期存活率降低了56.3%至89.6%,若虫虫体长宽减小,雌成虫寿命降低29.8%至48.6%,平均单雌产卵量降低49.8%至72.5%。清水对照、0.15mg/L和0.30mg/L印楝素溶液处理1日龄卵,烟粉虱实验种群的内禀增长率分别为0.227、0.0742和0.060,净增殖率依次为36.40、7.29和5.33;处理5日龄卵时两者分别为0.126、0.114和0.059与39.192、3.59和4.93。  相似文献   

10.
本文采用高效液相色谱外标法,以甲醇+水为流动相,配比为85∶15,使用ODS—C185μm为填料的不锈钢柱,检测波长254nm,流速为1.0 mL/min,对制备的虱螨脲20%水悬浮剂进行定量分析。结果表明,该分析方法的线性相关系数为0.999 9,标准差为0.15,变异系数为0.76%,平均回收率为100.42%。  相似文献   

11.
We first discuss the diversity of fruit fly (Diptera: Tephritidae) parasitoids (Hymenoptera) of the Neotropics. Even though the emphasis is on Anastrepha parasitoids, we also review all the information available on parasitoids attacking flies in the genera Ceratitis, Rhagoletis, Rhagoletotrypeta, Toxotrypana and Zonosemata. We center our analysis in parasitoid guilds, parasitoid assemblage size and fly host profiles. We also discuss distribution patterns and the taxonomic status of all known Anastrepha parasitoids. We follow by providing a historical overview of biological control of pestiferous tephritids in Latin American and Florida (U.S.A.) and by analyzing the success or failure of classical and augmentative biological control programs implemented to date in these regions. We also discuss the lack of success of introductions of exotic fruit fly parasitoids in various Latin American countries. We finish by discussing the most pressing needs related to fruit fly biological control (classical, augmentative, and conservation modalities) in areas of the Neotropics where fruit fly populations severely restrict the development of commercial fruit growing. We also address the need for much more intensive research on the bioecology of native fruit fly parasitoids.  相似文献   

12.
《干旱区科学》2014,(6):782-782
正Journal of Arid Land(JAL)is an international journal(ISSN 1674-6767;CN 65-1278/K)for the natural sciences,sponsored by the Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences and Science Press.It is published by Science Press and Springer-Verlag Berlin Heidelberg bimonthly.JAL publishes original,innovative,and integrative research from arid and semiarid regions,ad  相似文献   

13.
Liriomyza cicerina (Diptera: Agromyzidae) is an important pest on chickpea in Turkey. The objective of this study was to determine the parasitoids and rates of parasitism ofL. cicerina on chickpea (Cicer arietinum L.) during the 2005 and 2006 seasons in ?anl?urfa province, Turkey. Leaves with mines were sampled weekly and kept in the laboratory to observe and count emerging leafminer and parasitoid adults. Eight parasitoid species were collected: the braconidsOpius monilicornis Fischer andOpius tersus Foerster and the eulophidsDiaulinopsis arenaria (Erdös) andNeochrysocharis formosa (Westwood), which occurred in both the winter and summer seasons;Diglyphus crassinervis Erdös,Neochrysocharis ambitiosa Hansson,Neochrysocharis sericea (Erdös) andPediobius metallicus (Nees), which occurred only in the summer growing areas.Diaulinopsis arenaria was the predominant parasitoid with 4–7.7% parasitism rate whileN. ambitiosa andO. monilicornis were the second and third most predominant species. The results of these trials show that sinceDia. arenaria occurred throughout every season, it could potentially be used for control of the leafminerL. cicerina.  相似文献   

14.
Systematic information on the quantitative impact of Z ygogramma bicolorata on the biology of P arthenium hysterophorus is crucial as the seeds of this weed continue to germinate from the accumulated soil seed bank throughout the year in the form of different germinating flushes, while the activity of the beetle ceases during winter as it enters diapause. Therefore, plant–herbivore interactions need to be explored to develop predictions of the overall impact of the introduced beetle on the weed. The findings revealed that defoliation by Z . bicolorata had a significant impact on the plant height, density and flower production in flushes F 3, F 4 and F 5, but not in F 1 and F 2 that exhibited longer periodicity, profuse branching, a longer flowering period and maximum flower production and contributed mostly to the existing seed soil bank. Therefore, total depletion of the existing soil seed bank was not possible. Consequently, the effect of augmentative field releases of laboratory‐reared beetles was explored on F 1 and F 2 in February for three consecutive years (2011–2013). Before initiating the trial, random soil samples were taken from the plots that were assigned to the paired treatments (i.e. with the beetle and without the beetle [insecticide‐treated]) and it was found that the seed bank in those samples did not differ. The single release of Z . bicolorata adults at five per plant at the six‐leaf stage significantly reduced the soil seed bank, compared to without the biocontrol agent, irrespective of the flushes at the end of the season.  相似文献   

15.
16.
The effects of the saprophytic mycoflora and its interference with cereal aphids on growth and yield of winter and spring wheat was studied in field experiments in 1980, 1981 and 1982.Yields varied between 5000 and 8000 kg dry matter of kernels per ha. The effect of the saprophytic mycoflora on yield was determined in different treatments: A) no control measures against cereal aphids and saprophytic and necrotrophic fungi, B) no control of cereal aphids, control of saprophytic and necrotrophic fungi, C) control of cereal aphids and control of saprophytic and necrotrophic fungi, D) control of cereal aphids and stimulation of saprophytic mycoflora and E) control of cereal aphids, no control of saprophytic and necrotrophic fungi nor stimulation of saprophytic mycoflora.Considerable differences in top densities of saprophytic mycoflora (10 times as large in A and D as in B and C) were determined. The consequences of these differences for the growth and productivity of wheat were minor. A negative effect of saprophytic mycoflora on the yield could not be detected in 1981 and 1982, whereas a small positive significant effect was found in 1980. This stimulation may have been due to competition between necrotrophic fungal pathogens and saprophytic mycoflora. As a result of favourable weather conditions necrotrophic fungal pathogens were very numerous in 1980 and could form an important yield reducing factor. Yield levels may effect the importance of the necrotrophic and saprophytic mycoflora as yield reducing factors. Additionally, in the presence of aphid honeydew captafol was found to be relatively ineffective against saprophytic fungi.  相似文献   

17.
18.
A gas chromatographic method was developed to quantify the phytotoxin prehelminthosporol, which is a sesquiterpene metabolite of the plant pathogen Bipolaris sorokiniana. The toxin was extracted from mycelium or culture filtrates, pre-cleaned using solid phase extraction, and analyzed by gas chromatography as a trimethylsilyl-derivative. The detection limit of the method was 5ngl–1 (signal to noise ratio 4:1) which corresponds to ca. 15ng prehelminthosporol per mg dry weight of mycelium or 15ng prehelminthosporol per ml culture filtrate. The total amount of prehelminthosporol (mycelium plus culture filtrate) increased with cultivation time when examined in six isolates of B. sorokiniana after 6, 9, 12 and 15 days of incubation. The screening experiment of 17 isolates for prehelminthosporol production after 8 days of incubation revealed significant differences in the toxin production between the isolates. The isolates with low toxin production had lower virulence towards barley roots compared to those with higher production of the toxin. However, the virulence did not increase with prehelminthosporol level among the high producing isolates. Prehelminthosporol was also analyzed in a number of related Bipolaris and Drechslera species. In addition to B. sorokiniana, three out of six Bipolaris species (B. setariae, B. zeicola, B. victoriae) produced prehelminthosporol, which indicates that ability to produce prehelminthosporol is conserved among closely-related Bipolaris species.  相似文献   

19.
20.
Nathan  S. Senthil  Chung  Paul Gene  Murugan  K. 《Phytoparasitica》2004,32(5):433-443
The effect of botanical insecticides and bacterial toxins on gut enzyme activity of larvae of the rice leaffolderCnaphalocrocis medinalis (Guenée) (Insecta: Lepidoptera: Pyralidae) was investigated. Gut enzyme activities were affected by botanical insecticides and bacterial toxin individually and in combination. When fed a diet of rice leaves treated with botanical insecticides and bacterial toxins, in bioassays the activities of gut tissue enzymes — acid phosphatases (ACP), alkaline phosphatases (ALP) and adenosine triphosphatases (ATPase) — of rice leaffolder larvae were affected. When combined, the effect was more severe at a low concentration. Larvae that were chronically exposed to botanical insecticides and bacterial toxins showed a reduction in weight (59–89%) and exhibited a significant reduction in ACP, ALP and ATPase activities. The combination ofBacillus thuringiensis kurstaki and botanical insecticides caused a decrease of twofold in enzyme activity even at reduced concentration. A synergistic effect was found when botanical insecticides and bacterial toxins were combined at low doses. These effects were most pronounced in early instars. Clear dose-response relationships were established with respect to enzyme activity. In conclusion: (i) biopesticides are relatively safe and biodegradable; (ii) a synergistic effect of botanical insecticides and bacterial toxins was found; (iii) less expensive, readily available and naturally occurring biopesticides could be an alternative for organic and inorganic pesticides in controlling RLF. http://www.phytoparasitica.org posting Sept. 28, 2004.  相似文献   

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