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特谱唑防治小麦白粉病研究小麦白粉病是我国小麦主要病害，目前生产上靠粉锈宁防治，由于长期单一使用。已开始显示出抗药性，为了开发新品种，取代粉锈宁或与粉锈宁交替使用，中国农科院植保所等单位从１９９１～１９９４年连续４ａ进行了１２．５％特谱唑可湿粉防治小麦... 相似文献
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小麦白粉病,最近连年流行,危害很重;而现有杀菌剂防治效果不理想。本所从各种杀菌剂的药效比较中,发现粉锈宁(天津南开大学元素所提供)对白粉病有特效。 1.不同药剂的药效比较:田间试验,小区面积0.02亩,重复三次,每小区喷药2次(4/13、4/23),每次用药后10天调查病情。供试药剂为25％粉锈宁粉剂、25％粉锈宁胶悬剂、40％多菌灵百菌清混合剂、40％多菌 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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小麦白粉病是我县小麦产区的重要病害之一。自1979年以来,随着小麦品种退化、密度加大和偏施氮素化肥,加之气候适宜,小麦白粉病连年严重发生。1981年,108万亩小麦,发生白粉病面积达40多万亩,成灾面积近10万亩左右,千粒重降低4.25％。82年全面推行小麦白粉病综合防治措施,使84年小麦白粉病发生面积减少到2.1万亩, 相似文献
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以盆栽苦瓜苗接种白粉病为试材,室内测定粉唑醇和三唑酮的毒力。结果表明：粉唑醇的EC趴EC90分别为23．7851mg／L、110．8963mg／L,三唑酮的EC50、EC90分别为41．1813mg/L、290．9136mg ai/L,说明粉唑醇对苦瓜白粉病的活性好于三唑酮。田间药效试验结果证明：在苦瓜白粉病发生初期,用粉唑醇12．5％悬浮剂有效剂量83．75mg／L～125．0mg／L,连续喷药3次,使用间隔期10～15d,防效达到66．00％～83．44％,是目前防治苦瓜白粉病较理想的杀菌剂。 相似文献
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在温室大棚用苯醚甲环唑、苯醚甲环唑+丙环唑、氟硅唑、腈菌唑和三唑酮等杀菌剂防治草莓白粉病Sphaerotheca aphanis。结果表明,适宜浓度的 10%苯醚甲环唑WG、30%苯醚甲环唑+丙环唑EC、40%氟硅唑EC、20%三唑酮EC、12.5%腈菌唑EC的田间防治效果均可达到80%以上;苯醚甲环唑、苯醚甲环唑+丙环唑、氟硅唑和三唑酮的持效期约为18 d,而腈菌唑的持效期较短,约为7 d。10%苯醚甲环唑WG在360~900 g/hm2用量时不影响草莓长势,而氟硅唑225 mL/hm2和三唑酮300~450 mL/hm2用量时则在不同程度上抑制草莓的生长。 相似文献
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We evaluated, water-based very-low volume (VLV) sprays of various pyrethroids at different dosage levels, comparing these with ultra-low volume (ULV) sprays for the control of cotton pests in the Nampula province of Mozambique. The results showed that karate (lambda-cyhalothrin) 2.5% SG at a dosage level of 15 g a.i./ha applied as VLV gave a significantly higher yield than karate 0.8% ULV (28 g a.i./ha). Also, karate 3.75% WG (12 and 15 g a.i./ha) gave a similar yield to that of karate 0.8% ULV (28 g a.i./ha). Karate 5% EC (15 and 20 g a.i./ha) gave a yield similar to Karate 0.8% ULV (28 g a.i./ha). Baythroid (cyfluthrin) 5% EC at 15, 22.5 and 30 g a.i./ha gave a yield similar to baythroid 1.2% ULV (36 g a.i./ha). Bulldock (beta-cyfluthrin) 12.5% SC at dosage levels of 6, 9 and 12 g a.i./ha gave a similar yield to that using baythroid 1.2% ULV (36 g a.i./ha). In all four trials, water-based VLV sprays gave a yield of cotton and degree of pest-control similar to those obtained with the ULV formulations at comparatively lower dosage levels. Integrated with other pest management practices, these could play an important role in the cost effective management of insect pests of cotton on small-scale farms in many countries. 相似文献
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Residual effects of triadimefon in soil on powdery mildew and yield of spring barley 总被引：1，自引：1，他引：0
Residual triadimefon (or a breakdown product), from a spray application (2 kg/ha) to field soil in 1978, significantly decreased powdery mildew on spring barley throughout two subsequent growing seasons, with consequent yield increases of 42% in 1980 and 18% in 1981.
In other field experiments triadimefon applied to soil at rates >0.06 kg/ha decreased mildew in barley growing in the soil 11 months later. In these experiments triadimefon, but not benomyl, imazalil or prochloraz (all at 0.5 kg/ha) significantly decreased mildew up to harvest and increased yield by 22%.
Triadimefon incorporated into a loam soil and a peat-based compost at rates >0.1 ng/g significantly decreased mildew on barley grown in pots under glasshouse conditions. Plants grown in the treated compost at the same time but in isolated pots supplied with filtered moistened air and capillary watering required more triadimefon (>100 ng/g) in soil for significant mildew control.
Despite strong adsorption of triadimefon to soil (Kd 19.4), an active substance appears to remain available for uptake and translocation by barley plants over long periods. The sensitivity of barley mildew to extremely small residues of triadimefon is discussed in relation to the siting of field experiments on mildew control. The implications for widespread commercial use of formulations containing triadimefon are discussed in relation to disease control practice in cereal growing systems. 相似文献
In other field experiments triadimefon applied to soil at rates >0.06 kg/ha decreased mildew in barley growing in the soil 11 months later. In these experiments triadimefon, but not benomyl, imazalil or prochloraz (all at 0.5 kg/ha) significantly decreased mildew up to harvest and increased yield by 22%.
Triadimefon incorporated into a loam soil and a peat-based compost at rates >0.1 ng/g significantly decreased mildew on barley grown in pots under glasshouse conditions. Plants grown in the treated compost at the same time but in isolated pots supplied with filtered moistened air and capillary watering required more triadimefon (>100 ng/g) in soil for significant mildew control.
Despite strong adsorption of triadimefon to soil (Kd 19.4), an active substance appears to remain available for uptake and translocation by barley plants over long periods. The sensitivity of barley mildew to extremely small residues of triadimefon is discussed in relation to the siting of field experiments on mildew control. The implications for widespread commercial use of formulations containing triadimefon are discussed in relation to disease control practice in cereal growing systems. 相似文献
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20%氟硅·咪鲜水乳剂防治黄瓜炭疽病的田间小区试验结果表明,在53.3～66.7mL/667m2剂量下,施药3～4次,间隔7～8d,可有效地控制黄瓜炭疽病的危害,并有提高产量和品质的作用。 相似文献
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三唑酮对木霉根际竞争定殖的影响 总被引：11，自引：1，他引：10
在粘壤土中施用4~12μg/g土三唑酮能提高耐药木霉菌株在西瓜根尖4~1cm处根际土中的种群密度。4μg三唑酮处理的木霉根际竞争定殖指数、以及在4~8cm和10~14cm根段的根际木霉种群密度均高于不施药对照。土壤接种量为1×103cfu/g土时木霉菌在西瓜根际增殖的比例较接种量为1×106cfu/g土时大,2种接种量下三唑酮处理的根际木霉种群密度分别高于相应的不加药对照。在质地较好、C/N比值较高的粘壤土中木霉菌在西瓜根际的种群密度较砂壤土和粘土大,三唑酮对木霉在西瓜根际的增殖作用也较明显。 相似文献