Integrated Pest Management in Cocoa Agroforests in Southern Cameroon: Constraints and Overview     

Denis J. Sonwa  Ousmane Coulibaly  A. Akinwumi Adesina  Stephan F. Weise  Mathurin Tchatat 《Integrated Pest Management Reviews》2002,7(3):191-199

Imports of pesticides have long been subsidised for use in the cocoa agroforests of the humid forest zone of southern Cameroon. With the liberalisation of the cocoa and pesticides sectors and the devaluation of the local currency (CFA franc), farmers are facing fluctuations in the price paid for cocoa and the high cost of farm inputs. Without the support of the extension services, they themselves have developed traditional integrated control methods based on the use of plant extracts mixed with conventional pesticides. From a survey of 300 cocoa farmers, the study assesses the farmers' command of these methods, the pests controlled, the problems encountered and the institutional constraints in the definition and dissemination of integrated control methods. The study concludes with recommendations for research and development towards the better definition and dissemination of integrated control methods. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

大白菜子叶离体培养再生植株   总被引：14，自引：0，他引：14  

张凤兰  高田烟義  徐家炳 《园艺学报》2002,29(4):348-351

 探讨了植物激素、AgNO₃ 和琼脂浓度对大白菜子叶培养芽再生和植株再生的影响。结果表明:优化培养基条件为MS 培养基中加入5 mg / L BA、0. 5 mg/ L NAA、2 mg/ L AgNO₃ 和1. 2%~ 1. 6 %琼脂。培养过程中, 子叶的乙烯释放量对芽再生起很重要的作用, 具有高芽再生率的基因型或高浓度琼脂的培养条件下, 子叶产生的乙烯量较少。培养基中有AgNO₃ 存在时, 尽管子叶的乙烯释放量增加, 芽再生率也有提高。对子叶的乙烯释放量和不定芽再生的关系进行了讨论。  相似文献   

早熟春大白菜新品种三园春皇的选育     

王文军  张利云  朱晓蕾  杨汝强 《中国蔬菜》2002,(2)

从北京、天津引进的大白菜品种中选育出两个自交不亲和系 90 2和 90 7,继而配制成春大白菜一代杂种三园春皇。该品种早熟 ,生长期 6 0～ 6 5d(天 ) ;一般 6 6 7m2 产量 40 0 0～ 6 0 0 0kg ,比对照鲁春白 1号增产16 % ;抗病毒病和霜霉病 ,对软腐病的抗性与对照相近 ;叶球橄榄形 ,质地脆嫩 ,品质优良。单球质量 2～ 2 .5kg  相似文献   

Effect of Jiawei Sini Decoction on glucocorticoid receptor in thymocytes of chronic psychological stress rats     

YAN Can  SHI Ya-fei  LI Yan  WU Zhi-wei  WU Li-li  PAN Yi 《园艺学报》2002,18(12):1494-1496

AIM: To observe the effect of Jiawei Sini Decoction (JWSND) on glucocorticoid receptor (GCR) in thymocytes of chronic psychological stress rats. METHODS: The rats were randomly divided into 4 groups, control group (C), model group (M), group treated by JWSND C₁, group treated by ginsenosides C₂. The number of thymocyte GCR sites and the GCR nuclear thanslocation rate were detected by radioimmunoassay. RESULTS: Compared with the control group, in the model group, the thymocyte weight index lowered significantly ( P<0.05 ), and the GCR nuclear thanslocation rate was increased significantly ( P<0.01 ), but the number of thymocyte GCR sites was unchanged. Compared with the model group, thymus gland weight indexes of C₁ and C₂ were increased significantly ( P<0.05 ), while the GCR nuclear thanslocation rate lowered significantly ( P<0.01 ). Moreover, no significant difference was found in all indexes between C₁ and control group. CONCLUSION: The inhibitory effect of glucocorticoid on the thymus could be significantly reversed by JWSND via suppressing the thanslocation of GCR from cytoplasm to nucleus in chronic psychological stress rats.  相似文献   

Effects of Taoren Honghua Jian on the hyperlipidemia without symptom     

CHEN Xiao-yin  ZHANG Qun  YANG Qin-he  XIE Qiu-ling  SHEN Qiang  XU Yun-sheng 《园艺学报》2002,18(12):1529-1531

AIM: To examine the effect of traditional chinese medicine recipe, Taoren Honghua(semen persicae-flos carthami) decoction, on hyperlipidemia without symptom. METHODS: The plasma TC, TG, LDL, HDL, apolipoprotein(Apo) A, Apo Bof the patients with hyperlipidemia without symptom were measured using automatic analyzer (shimadiu CL-7200), the production of nitric oxide(NO) was detected by Greiss reaction, and SODactivity and MDAformation were examined using o-trihydroxy benzene and barbituric methotheds, respectively. RESULTS: After oral administration of Taoren Honghua decoction, the plasma levels of TC, TG, LDL, and MDAof the patients were markedly decreased, however, the plasma levels of ApoA, HDL, SODand NOwere significantly increased and almost no change was detected in the plasma level of Apo B. In control group, it was found that although the plasma level of TC, TG and LDL were decreased ( P<0.05 ) and ApoAas well as HDLwere increased, ApoB, SOD, MDA and NO production were all unchanged. CONCLUSION: The traditional chinese medicine recipe, Taoren Honghua decoction,has a significant therapeutic effect on patients with hyperlipidemia by removing blood stasis, promoting qi circulation and in turn reducing blood lipid level.  相似文献   

中国李RAPD的优化反应体系及其在品种鉴定中的应用   总被引：20，自引：0，他引：20  

乔玉山  章镇  房经贵  郭洪 《果树学报》2003,20(6):445-449

以5'-GACCGCTTGT-3'为随机引物,以奉化李(Prunussalicinacv.Fenghuali)为试材,对中国李RAPD反应体系进行了优化研究,结果表明:25μL反应体系中,TaqDNA聚合酶、Mg2+、引物、模板DNA和dNTPs5种主要成分的适宜浓度或用量分别是:1.0U、2.5mmol/L、20ng、40ng和0.2mmol/L。利用该优化反应体系,用10个随机引物,构建了5个中国李品种的RAPD指纹图谱;并以共有谱带率对这些品种遗传关系进行了分析,5个中国李品种的共有谱带率平均为33.2%,变异幅度为20.1%～44.9%。  相似文献   

大白菜细胞核雄性不育基因向自交系97A407的转育   总被引：9，自引：0，他引：9  

许明  白明义  魏毓棠 《中国蔬菜》2003,1(2):8-10

根据复等位基因遗传假说 ,利用大白菜核不育系 9810 9和已知基因型的甲型两用系可育株 99135 2作为不育源 ,以大白菜自交系 97A40 7为目标亲本 ,经过 5个世代的转育 ,获得了具有 97A40 7遗传基因型的新甲型两用系、临时保持系和雄性不育系。  相似文献   

鸡球虫对机体的致病作用研究进展   总被引：3，自引：0，他引：3  

邓雯马彦博  刘玉梅 《家畜生态》2004,25(2):59-62

球虫在鸡体内进行生命活动的同时对鸡体产生不同程度的损害，球虫感染后的致病性和病理学反应是球虫与宿主机体相互作用的结果。本文就鸡球虫致病作用及其对宿主细胞代谢的影响、及影响球虫致病性的因素的研究进展予以综述，对鸡球虫病的防治具有一定的指导意义。  相似文献   

应用小白鼠代替鸡对禽霍乱蜂胶灭活疫苗进行效检的研究     

刘吉山  沈志强  王艳  林初文  李峰  赵蕾  刘万成 《中国兽药杂志》2004,38(6):7-9

为寻找其他有效的禽霍乱蜂胶灭活疫苗的效检方法,应用小白鼠代替本动物鸡对禽霍乱蜂胶灭活疫苗进行效检.结果表明,小白鼠免疫时体重15～18 g,疫苗免疫剂量0.3 mL/只,免疫10 d后攻毒,攻毒时体重20～25 g,攻毒剂量5～9 CFU/只时,可代替本动物鸡对禽霍乱蜂胶灭活疫苗进行效检,判定标准为免疫组8/10以上保护,对照组5/5死亡为合格.本效检方法可缩短检验期限7 d,降低检验成本,具有敏感、特异、客观、简便等特点.  相似文献   

蛋雏鸡大肠杆菌病的中草药防治研究试验   总被引：3，自引：0，他引：3  

秦四海 《中兽医医药杂志》2004,23(4):16-18

用自拟复方中草药对蛋雏鸡大肠杆菌病进行了人工感染治疗试验、中草药疗效试验和安全试验、临床治疗试验、临床预防试验,结果表明:该方药在治疗蛋雏鸡大肠杆菌病时采取中西医结合治疗效果最好;仅使用复方中草药治疗的效果不低于单独使用敏感的抗茵西药;使用复方中草药在临床上预防大肠杆茵病能获得较好效果;复方中草药无毒、无副作用、无残留,防治大肠杆菌病可用中草药代替抗茵西药,符合无公害产品生产要求.  相似文献