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采用银法利、安泰生和甲霜灵锰锌等化学药剂进行田间辣椒疫病防治试验,结果表明:68.75%银法利SC600倍+70%安泰生WP450倍防治3次,对疫病平均防效达84%以上,防治经济效益比达1∶8.0以上。 相似文献
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石香薷挥发油、大蒜素防治黄瓜疫病药效试验 总被引：1，自引：0，他引：1
GUO Xiaojun XIE Chengjun 《长江蔬菜》2008,(8)
石香薷挥发油、大蒜素各处理对黄瓜疫病均有较好的防治效果。其中石香薷挥发油600倍液和大蒜素挥发油500倍液处理对黄瓜疫病防治效果最好,第2次药后14d防效分别为93.68%,93.96%,是理想的无公害植物源杀菌剂。 相似文献
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石香薷挥发油、大蒜素各处理对黄瓜疫病均有较好的防治效果.其中石香薷挥发油600倍液和大蒜素挥发油500倍液处理时黄瓜疫病防治效果最好,第2次药后14 d防效分别为93.68%,93.96%,是理想的无公害植物源杀菌剂. 相似文献
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用24%米满悬浮剂防治苹果小卷叶蛾等卷叶害虫的药效试验结果,1 500～2 500倍液花前第1次施药后5d对越冬出蛰幼虫的防治效果为93.75%～95.00%,花后第2次施药后15d防治效果高达94.78%～97.36%;对苹果小卷叶蛾第1代幼虫的防治效果高达93.63%～96.31%. 相似文献
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对6年生阳光玫瑰葡萄的霜霉病,采用了8种药剂进行了2022—2023年2年的田间防治效果试验,于每年7月霜霉病开始发生时进行喷药,按照药剂生产厂家推荐的喷施浓度间隔10 d喷1次,共喷3次,以喷清水为对照。结果表明,供试的8种药对葡萄霜霉病均有一定的防治效果且对植株安全无药害。其中2种药剂60%霜脲·嘧菌酯水分散粒剂1 500倍液、31%噁酮·氟噻唑悬浮剂1 500倍液防效突出,2年防效稳定在90%以上,为理想选择药剂;4种药剂40%克菌·戊唑醇悬浮剂1 000倍液、40%烯酰·氰霜唑悬浮剂2 000倍液、22.5%啶氧菌酯悬浮剂1 500倍液、50%烯酰吗啉可湿性粉剂1 500倍液防效均在80%以上,为可选用药剂;另2种药剂58%甲霜·锰锌可湿性粉剂500倍液、75%百菌清可湿性粉剂500倍液防效不够理想,不宜用于防治葡萄霜霉病。 相似文献
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在南瓜白粉病的始发期,比较3种杀菌剂对南瓜白粉病的防治效果.试验结果表明,第1次和第2次药后7天福星(40%氟硅唑乳油7 500倍液)、成标(80%硫磺干悬浮剂600倍液)和15%三唑酮可湿性粉剂1 000倍液的防治效果分别为95.69%,94.43%,92.74%和80.85%,73.08%,68.91%.其中,2次施药后福星的防治效果都显著高于三唑酮的,而福星和成标、成标与三唑酮之间差异均不显著.因此,这3种杀菌剂均可作为防治南瓜白粉病的有效药剂,其中福星可作为南瓜白粉病防治的首选药刺. 相似文献
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为了筛选出防治设施草莓白粉病的高效杀菌剂，选择11种杀菌剂结合清除病残体进行田间药效试验，以期为大田草莓白粉病防治提供参考依据。试验结果表明：在清除病残体的情况下，不同杀菌剂对草莓白粉病均有一定程度的抑制作用，其中25%乙嘧酚磺酸酯微乳剂在3次用药后防效逐渐增加，至第3次药后7 d在所有药剂中防效最好，达到79.90%;66.8%嘧霉胺悬浮剂药效的速效性和持续性好，在第1、2次施药后7 d防效均为第1，均显著高于其他处理；丙烯酸酯类杀菌剂25%乙嘧酚悬浮剂表现出良好的速效性和持续性，前2次施药后7 d防治效果均在70%以上，显著高于除66.8%嘧霉胺悬浮剂以外的其他药剂处理；除30%氟菌唑可湿性粉剂有轻微药害产生，其余各供试药剂按照试验浓度施药，草莓生长安全、无药害产生。 相似文献
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Powdery mildew (Sphaerotheca fuliginea Pollacci) infection in cucumber was significantly reduced by foliar application of a mixture of riboflavin and methionine (RM). The effects of fungicidal activity on leaves applied with RM were detected through restriction of progress of colonies and disease severity compared with control plants. The initial response to foliar application of RM was abrupt generation of hydrogen peroxide in the leaves of cucumber plants. Activities of antioxidant enzymes such as SOD and POD were abruptly increased by foliar application of RM. However, activities of antioxidant enzymes in control plants were increased with disease development 9 d after pathogen inoculation. Cucumber leaves have six major SOD isoforms. When plants were foliar-applied with RM, densities of three SOD isozyme bands at SOD-1, SOD-2, and SOD-3 were increased 3 d after foliar application. Leaves of cucumber plants have three major POD isozyme bands. Densities of three POD isozyme bands were increased 3 d after foliar application with RM. Four major PPO isozyme bands were determined in cucumber leaves. Though the overall banding patterns of PPO in control and RM-applied plants were similar, the band profiles in leaves applied with RM were characterized by high densities of the three major isoforms. Activities of PPO in leaves applied with RM increased rapidly during the 3 d after foliar application, and then remained relatively constant for 15 d. Although activities of PPO in the leaves of control plants also abruptly increased after 9 d, it was lower than those of RM-applied plants during the whole time. The difference in lignin content between control and RM-applied plants was detected 9 d after foliar application; it was high in leaves applied with RM. 相似文献
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以黄瓜褐斑病〔Corynespora cassiicola(Berk.Curt.)Wei.〕为供试病原菌,通过室内生物活性测定和田间小区防效试验,测定了噁酮锰锌对黄瓜褐斑病的防效。室内生物活性测定结果表明,噁酮锰锌和代森锰锌对黄瓜褐斑病菌的EC_(50)分别为1.16 mg·L~(-1)和6.23 mg·L~(-1)。田间试验结果表明,用68.75%噁酮锰锌水分散粒剂468.0、625.5、937.5 g·hm~(-2)连续3次施药后,对黄瓜褐斑病的防效可达到78.61%、89.33%和90.28%。且试验浓度下对黄瓜安全,无药害产生。 相似文献
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【目的】探究6个枣树品种枣疯病抗性差异以及枣树体内植原体迁移特性差异,为抗枣疯病枣树品种的选择利用以及枣疯病的防治提供基础数据。【方法】通过采集携带植原体的鸡心脆枣接穗,嫁接到健康枣树砧木上,采用田间调查与普通PCR技术相结合方法,比较不同品种抗枣疯病情况与植原体在不同枣树品种中迁移情况。【结果】不同枣树品种发病时间不同,发病率差异显著,蜂蜜罐枣、尜尜枣和猴头枣为抗病类型,冬枣、红螺脆枣和鸡心脆枣为感病类型。植原体在不同枣树品种中迁移速度不同,植原体在鸡心脆枣和冬枣内迁移速度最快,其后依次为蜂蜜罐枣、红螺脆枣、尜尜枣,在猴头枣内迁移速度最慢。【结论】6个枣树品种中蜂蜜罐枣、尜尜枣和猴头枣表现一定的抗病能力,初步确认了植原体在不同枣树品种体内迁移特征的差异,可为抗枣疯病品种的选择利用和枣疯病防治提供科学依据。 相似文献
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P. D. Drogoudi C. G. Tsipouridis G. Pantelidis 《The Journal of Horticultural Science and Biotechnology》2013,88(5):505-509
SummaryThe effects of light, moderate, or heavy thinning (5, 10, or 20 cm between fruit, respectively), conducted before (7 d or 15 d), during, or after (7 d or 15 d) pit hardening (PH), on the incidence of split pits, fruit yield, fruit quality characteristics, and leaf mineral contents, were studied in the canning peach (Prunus persica L. Batsch.) cultivar ‘Andross’ over two growing seasons. The percentage of fruit with split pits increased by 58.2% in heavily-thinned trees compared with moderately- or lightly-thinned trees, and by 22.9% for the earliest time of thinning (15 d before PH) compared with thinning during, or after PH. Fruit fresh weight (FW) was greater in moderately- and heavily-thinned trees compared with lightly-thinned trees, but yields were similar among the different crop-load treatments. The latest time of thinning (15 d after PH) also had a negative impact on yield at first harvest and on total yield, fruit FW, and delayed fruit ripening compared to thinning during, and 15 d before PH. Total anti-oxidant capacities and phenolic contents were usually greater in fruit from heavily-thinned compared with lightly- or moderately-thinned trees only when thinning was conducted during, or 15 d after PH. Moreover, anti-oxidant levels were highest in fruit from the earliest-thinned trees. There was no significant effect of crop load, or of time of thinning application treatment on fruit colour, or on the K, P, Fe, Mn, and Cu contents of leaf tissues. In conclusion, light or moderate thinning during PH resulted in minimal split pits during processing, and in optimal yields and fruit quality characteristics in the canning peach cultivar ‘Andross’. 相似文献
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几种新型生物药剂对黄瓜霜霉病的防治效果 总被引：1，自引：0，他引：1
为明确5种药剂对黄瓜霜霉病的防治效果,在黄瓜霜霉病发生初期采用叶面喷施的方式开展试验。结果表明:40%烯酰·嘧菌酯水分散粒剂和20%氰霜唑悬浮剂对黄瓜霜霉病具有较好的防效,连续施药3次后14 d防效分别为91.1%和88.4%,且两者不存在显著性差异。生物多肽作为新型生物药剂,对病害具有较好防控效果,第3次药后14 d生物多肽667 m~2用量150 mL处理组的防效为68.4%,与1.5%苦参碱可溶液剂和0.5%几丁聚糖水剂均不存在显著性差异。5种药剂按照试验浓度施用,均对黄瓜安全,且无药害产生。推荐在病害发生初期使用生物药剂防控,重病田块可与化学药剂交替应用。 相似文献
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于室内测定了不同温度下核型多角体病毒对甜菜夜蛾的致病力和不同浓度核型多角体病毒对甜菜夜蛾致病力的影响。结果表明,在（25±1）℃条件下,病毒浓度为1×107PIBs/mL、1×106PIBs/mL、1×105PIBs/mL、1×104PIBs/mL、1×103PIBs/mL时,甜菜夜蛾3龄幼虫感染10d后的累计死亡率分别为83.3%,83.3%,86.7%,90.3%,96.7%,但处理间差异不显著。温度显著影响甜菜夜蛾病毒的致病力。病毒浓度为1×106PIBs/mL时,在30℃和35℃下,甜菜夜蛾3龄幼虫感染10d后的累计死亡率均为96.7%,在15℃下仅为53.3%。在35℃,30℃,25℃,20℃,15℃下,LT50分别为5.0d,4.8d,5.4d,8.8d,13.7d。 相似文献
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AIM:To investigate the changes of CD27 and CD28 expression on cytokine-induced killer(CIK) cells and natural killer(NK) cells during cultivation.METHODS:The mononuclear cells were treated with interleukin-12(IL-2),IL-7,IL-15,stem cell factor and FLT3 ligand for four weeks.The CD27 and CD28 expression on CD3+CD56+ CIK cells and CD3-CD56+ NK cells were examined by flow cytometric analysis every week during four-week cultivation.RESULTS:The expression of CD27 on CIK and NK cells two weeks after cultivation reached the peak value at（44.57±4.07）% and（51.02±5.20）%, respectively.Then, their expression declined gradually to about 30% in the fourth week.The expression of CD28 on CIK and NK cells reached the peak at the third and the second week, the values were （4.40±0.66）% and （45.14±3.58）%, respectively, decreased rapidly and then were almost completely lost at the fourth week.CONCLUSION:According to the changes of expressions of CD27 and CD28 on CIK/NK cells, optimal harvest time of cultured CIK/NK cells should be at the third week of cultivation. 相似文献
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Keiichi Nomura H. Terai K. Yabe M. Maeda M. S. M. Rahman M. Yoshida 《The Journal of Horticultural Science and Biotechnology》2013,88(4):617-622
SummaryChanges in fruit weight, total soluble solids (TSS), sugar content and postharvest ethylene production during fruit development were compared on fruit of cherimoya (Annona cherimola Mill., cv. Big Sister) pollinated at different times (early, at the beginning of April, 1995 and late, at the end of May, 1994). Fruit weight increased by growth, independently of pollination times. Changes in TSS and sugar content were strongly affected by pollination time. In late pollinated fruits, both TSS and sugar content increased during the growth period, 110–160 d after pollination, while neither increased with fruit growth in early pollinated fruit. Moreover, changes in TSS and sugar content after ripening depended not only on pollination time but also on the growth period. With late pollination, fruit harvested after 140 d became edible after ripening. The TSS and total sugar contents, (the sum of fructose, glucose and sucrose contents) increased to about 20° Brix and above 16%, respectively. But early pollinated fruits were not edible after ripening, since total sugar content increased only to about 7%, even though they kept growing for 160 d on the tree. The maximum rate of ethylene production declined and the number of days to the ethylene peak from harvest is also reduced with growth in both cases. These changes were closely correlated with days after pollination (r>0.9) regardless of pollination time. Comparisons of accumulated temperature suggest that temperature at pollination time and during the resting period of growth affected fruit development. These results indicate that neither fruit weight nor number of days after pollination is a suitable index for harvesting time. 相似文献