共查询到19条相似文献,搜索用时 171 毫秒
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粉锈宁(也称三唑铜)是一种高效、低毒、广谱、持效期长的内吸性杀菌剂,能防治40几种作物的病害,尤其对禾谷类作物的白粉病、锈病、黑粉病等防效突出。 国外粉锈宁的剂型为可湿性粉剂、乳剂、粉剂和糊剂。南开大学元素所自1980年开始研制粉锈宁胶悬剂,经4年(1980—1983)在本所温室及外单位田间试验证明,粉锈宁 相似文献
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通过果园施药试验,比较30%腈吡螨酯悬浮剂不同用量处理与对照药剂20%三唑锡可湿性粉剂对苹果叶螨的防治效果,以及与对照药剂24%螺螨酯悬浮剂对二斑叶螨的防治效果。结果表明,30%腈吡螨酯悬浮剂2 000~4 000倍液处理对两种害螨均具较高防效,速效性和持效性也较好。药后1 d,该药剂防治苹果叶螨校正防效为88.40%~94.11%,防治二斑叶螨校正防效为83.55%~92.83%。药后14 d,该药剂防治苹果叶螨效果达99%以上,3个用量处理间防效无显著差异,均显著高于三唑锡;防治二斑叶螨效果达96.87~99.57%,与螺螨酯无显著差异。在试验剂量下,喷施腈吡螨酯对苹果树生长安全。 相似文献
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特谱唑(速保利、消斑灵、烯唑醇)是一种防治小麦白粉病的有效药剂,其用药量低,持效期长,使用安全,是粉锈宁理想的换代产品或与粉锈宁交替使用。田间示范表明,666.7m~2用成药30g于小麦白粉病发病初期喷施,一次可控制小麦整个生育期白粉病为害,有良好的经济效益。平均防效93.21%。增产率为5.20%,对白粉病具有很强的治疗和铲除作用。 相似文献
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粉锈宁和羟锈宁拌种防治玉米丝黑穗病的田间试验表明,墒情影响药效,墒情好,药效高。正常低土温和正常高墒情相结合,可以达到既压低发病基数,又获得高防效的双重目的。粉锈宁和羟锈宁的防效是近似的。墒情对羟锈宁的影响似更敏感,其防效的稳定性较粉锈宁差,但羟锈宁对幼苗的抑制轻,在逆境下造成的药害小。两种药剂的胶悬剂并不比可湿性粉剂优越。乳剂防效稍高,但药害较重。与促进生长的激素浸种结合应用有降低药效的趋势,不宜采用。室内试验证明,过饱和墒、过低土温和厚复土三者结合是田间按常用量拌种有时造成药害的原因。药害主要发生在干种至种子开始萌动阶段。玉米自交系的抗药性比杂交种差,应用药剂拌种时尤需慎重。 相似文献
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三种粉锈宁络合物,即保丰宁、植保宁和粉锈铜对小麦锈病防病保产效果显著,用药量低、持效期长,使用安全,而且在田间试验与粉锈宁用药量相同的情况下,其效果接近。据室内测定,植保宁具有较强的内吸传导性能,但基本上是向上传导;具有较强的治疗和铲除作用,但对夏孢子萌发的影响很弱。据田间试验,用药量与品种感病性关系密切,随着小麦品种感病性提高,用药量应适当增加,才能控制锈病为害;施药次数主要取决于施药时小麦所处的生育期,施药1次的适期在病叶率5%—10%时、小麦处于旗叶伸长至抽穗期。 相似文献
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A field trial was conducted in the south of the Netherlands over a period of 3 years (1992–94) in order to test the effect of fenpropimorph-containing fungicides on the sensitivity of Erysiphe graminis f.sp. tritici to fenpropimorph. In general, use of split applications resulted in a better protection against wheat powdery mildew than use of normal applications. This is ascribed to a better timing of the split applications. The sensitivity to fenpropimorph of the mildew population in plots treated with normal applications of both fungicides did not change during the growing seasons of the years investigated. In contrast, the sensitivity of the mildew population from plots treated with split applications of Corbel became significantly lower. A significantly lower sensitivity was also found in the mildew population from plots treated with split applications of Tilt Top in 1993 and 1994. These results indicate that split applications can increase the rate at which E. graminis f.sp. tritici can become less sensitive to fenpropimorph. Because maintenance of sensitivity of the pathogen population is valued highly, the split application strategy of fenpropimorph-containing fungicides is not recommended for wheat powdery mildew control. 相似文献
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本文研究枯草芽孢杆菌Bacillus subtilis BAB-1水剂、解淀粉芽孢杆菌B.amylololiquefaciens SAB-1水剂、大花旋覆花内酯乳油与化学杀菌剂交替或混合使用对温室黄瓜病害发展的影响.寿光试验包括以下处理:交替或混合喷施50%啶酰菌胺WG、68.75%氟吡菌胺·霜霉威SC的桶混液、60%唑醚·代森联WG、40%嘧霉胺SC、50%烯酰吗啉WP、10%苯醚甲环唑WG、69%烯酰·锰锌WP、68.75%噁唑·锰锌WG、52.5%噁唑·霜脲氰WG等不同作用机理和防治谱的化学杀菌剂;混施生防菌剂BAB-1水剂、SAB-1水剂及68.75%氟吡菌胺·霜霉威SC、50%烯酰吗啉WP、25%双炔酰菌胺SC、25%吡唑醚菌酯EC等对霜霉病特效化学杀菌剂;将不同化学杀菌剂桶混液与BAB-1水剂、SAB-1水剂和化学杀菌剂桶混液交替喷施.其对黄瓜霜霉病的防效分别为94.5%、92.3%和93.6%,对黄瓜白粉病分别为90.7%、89.9%和90.4%,对灰霉病的防效分别为69.3%、85.6%和85.7%,每种病害的病害发展曲线下面积(AUDPC)相当.在定州试验中,化学杀菌剂与SAB-1混施对白粉病的防效(84%)明显高于其与BAB-1混施的防效(72.8%),对灰霉病的防效(61.3%)明显低于后者的防效(95.1%),与SAB-1、BAB-1混施后对白粉病、灰霉病及霜霉病防效分别为90.2%、89.3%和92.6%.在保定郊区试验中,将大花旋覆花内酯乳油与化学杀菌剂及BAB-1水剂、SAB-1水剂交替喷施显著降低霜霉病、白粉病及灰霉病的严重度及AUDPC,对其防效分别为83.5%、87.4%和88.5%,AUDPC分别为219、352和249,延缓了3种黄瓜病害的发展. 相似文献
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A.J. Dik M.A. Verhaar R.R. Bélanger 《European journal of plant pathology / European Foundation for Plant Pathology》1998,104(4):413-423
The effect of three reported biological control agents, Ampelomyces quisqualis, Verticillium lecanii and Sporothrix flocculosa, was tested against cucumber powdery mildew (Sphaerotheca fuliginea). Two glasshouse experiments, one in the summer and one in winter/spring were conducted on a semi-commercial scale. In both experiments, a susceptible and a partially resistant cultivar were used. In the second experiment, the additional effect of integration of biological control and silicon amendments to the nutrient solution was also assessed. In both experiments, A. quisqualis did not control the disease. V. lecanii had a small effect on powdery mildew in the first experiment but not in the second. S. flocculosa gave the best control of powdery mildew in both experiments. In the first experiment, weekly application of S. flocculosa reduced disease in the partially resistant cultivar to the same level as a treatment in which the fungicides bupirimate and imazalil were each applied once. Addition of silicon in the nutrient solution in a concentration of 0.75 mM reduced disease by 10–16%, averaged over all treatments. There was no interaction between silicon and the biocontrol agents. Yield was recorded in the second experiment and was significantly increased by the fungicide treatment compared to the control in the partially resistant cultivar. Yield in the treatment with S. flocculosa was not significantly different from the fungicide treatment in this cultivar. Silicon had no effect on yield in either cultivar. 相似文献
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The effects of seven adjuvants (at 0, 0.5, 1.0 and 2.0 g litre?1) on the efficacies of four fungicides al 0.5 g litre?1 were studied in the laboratory for the control of leaf-spot in celery (caused by Septoria apiicola) and powdery mildew on winter wheat (caused by Erysiphe graminis). The most effective fungicides for controlling leaf-spot were: tebuconazole + triadimenol = flutriafol > mancozeb + oxadixyl > prochloraz. However, addition of adjuvant to the fungicides gave a modified pattern of effectiveness. The efficacy of flutriafol was strongly enhanced by addition of all adjuvants, but those of prochloraz and mancozeb+oxadixyl only partially so. The tested adjuvants were mineral oil + surfactant, a polymer/alkoxylated alkyl ether blend, an ethoxylated alkylphenol, an ethoxylated hexitan ester blend, an ethoxylated nonylphenol and an alkylpolysaccharide- based adjuvant mixture. However, the addition of adjuvants to tebuconazole + triadimenol had a negative effect. Of all the adjuvants tested, the nonylphenol ethoxylate and a mixture of mineral oil /surfactant and alkylpolysaccharides gave the highest efficacy with the fungicides, while the mineral oil/surfactant and the alkylpolysaccharides alone were less effective. There was a positive relationship between high concentrations of adjuvants and their effectiveness, but there were some exceptions. The most effective fungicides for control of powdery mildew in wheat were prochloraz, mancozeb + oxadixyl and tebuconazole + triadimenol. There was a linear relationship between the high efficacy of the fungicide and the concentration of adjuvants to control powdery mildew in wheat. The highest concentration of adjuvant (2-0 g litre?1) gave the highest efficacy for the fungicides. 相似文献
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Moshe Reuveni Moshe Harpaz Reuven Reuveni 《European journal of plant pathology / European Foundation for Plant Pathology》1998,104(9):853-860
Foliar sprays of solutions of di-potassium hydrogen orthophosphate, K2HPO4 (DKP) and potassium di-hydrogen orthophosphate, KH2PO4 (MKP), commercial systemic fungicides, and an alternating treatment with phosphate fertilizer and systemic fungicides inhibited development of the powdery mildew fungus, Oidium mangiferae, on flowers and bloom clusters of field-grown mango trees. The effectiveness of the alternation treatments with an appropriate systemic fungicide and 1% solution of mono-potassium phosphate (MKP) in controlling powdery mildew on bloom clusters was similar to that of the commercial treatment with the systemic fungicides. However, application of the systemic fungicides alone, on the same dates on which they were applied in the alternation treatment, without application of the phosphate treatment was significantly less effective in controlling the disease than either the phosphate or the alternation treatment. This indicates that the use of phosphate fertilizer has a significant role in disease control and that it can reduce the number of fungicide treatments necessary against powdery mildew by up to 50%. These results were confirmed in large-scale demonstration trials conducted in commercial orchards in 1994 and 1995. Our 1997 findings also revealed that tank-mix treatments of 1% MKP solution with half the recommended quantity of sterol inhibitor fungicide applied at 14-day intervals provided a protection against powdery mildew comparable with or superior to that given by the standard fungicides-based treatment applied at 7-day intervals. Tank-mix treatments of MKP (1%) with sterol inhibitor at the recommended rate or with the new strobilurin Kresoxym-methyl (BAS 490F, strobi), or the BAS 490F alone, were the most effective, and provided >95% protection against O. mangiferae, compared with the control. Phosphate solutions were found not to be phytotoxic to plant tissue. These treatments affected the yield of mango trees: a significantly lower yield was observed on control untreated trees, probably because of powdery mildew infection on flowers. The inhibitory effectiveness of phosphate salts makes them a potential major component of an integrated pest management program. 相似文献
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The effects of powdery mildew (caused by Sphaerotheca fuliginea )on muskmelon seedlings and the efficacy of seed treatment with systemic fungicides were examined under controlled environmental conditions. The fresh weight of seedlings infected with powdery mildew was substantially less than that of uninoculated seedlings 5 weeks after inoculation, and the inoculated seedlings shrivelled 1 week later. The fungicides fenarimol and triadimenol applied to the seeds did not affect germination and suppressed powdery mildew effectively when applied at a rate equivalent to 8 g fungicide product per kg seed. Under conditions moderately conducive to the pathogen, fenarimol markedly reduced disease severity and its effect when applied as a seed treatment was as effective as foliar treatment. When conditions were highly conducive to the pathogen, seed treatment with fenarimol was not effective. Development of powdery mildew and efficacy of the seed treatments were related to soil type: disease developed earlier and more intensely on seedlings grown in sandy soil than those in organic medium, and seed treatment had a more pronounced effect on seedlings grown in sandy soil. The results indicate that fungicidal treatment of muskmelon seeds may offer an adequate means of reducing powdery mildew infections on seedlings. 相似文献