露娜森和拿敌稳对芒果采后炭疽病的防治效果

为探索芒果花果期喷施杀菌剂而实现防控采后炭疽病的方法,选取露娜森和拿敌稳杀菌剂开展采后炭疽病防治试验。设计每种杀菌剂2个施药剂量梯度,咪鲜胺试验区,另设空白试验,共6个处理,比较各药剂处理间病情指数。试验结果表明,本实验所选用的药剂对芒果花果期的嫩叶、花、幼果未见药害,也不影响芒果的后熟,且采后7天时,花果期喷施1500倍浓度的露娜森的防效与采后浸果咪鲜胺的防效相当、防效达72.73%,货架期可维持7天,750倍浓度拿敌稳次之,对芒果炭疽病的采后储藏期有较好的防治效果,明显延长了芒果的货架期、储藏期。由于露娜森中含有新型的琥珀酸脱氢酶抑制剂——氟吡菌酰胺的原因,其作用机理是抑制了琥珀酸脱氢酶的活性。琥珀酸脱氢酶抑制剂类杀菌剂通过干扰复合体Ⅱ上4个亚基来抑制线粒体的功能,阻止其产生能量,抑制病原菌生长,与咪鲜胺处理的结果一致,具有一定的推广应用价值。     

Multicentric mast cell tumors in a horse

Abstract: A 6‐year‐old female Rocky Mountain horse was presented for evaluation of draining tracts and distal limb subcutaneous edema on the left front and left hind limbs that had been present for 2 weeks. Direct smears of fluid collected by fine‐needle aspiration of subcutaneous fluid from both limbs were highly cellular with a predominance of eosinophils accompanied by numerous, moderately atypical, variably granulated mast cells. The cytologic diagnosis was mast cell tumor (MCT) with prominent eosinophilic infiltration with a differential diagnosis of eosinophilic granuloma. Histologic evaluation of surgical biopsies of lesions from both limbs was performed on sections stained with H&E, toluidine blue, and Luna stains. The histologic diagnosis was MCT, and staining with toluidine blue and Luna stains confirmed the presence of mast cells and eosinophils, respectively. In addition, the mast cells strongly expressed CD117. This is the first reported case of cutaneous mast cell neoplasia in a horse in which primary presenting complaints were draining tracts and distal limb subcutaneous edema involving multiple limbs. This case illustrates the utility of staining for CD117 expression in combination with traditional stains, such as toluidine blue and Luna, in differentiating MCTs from other eosinophilic lesions in horses.