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Development of leaf silvering in squash cultivars infested by silverleaf whitefly

机译：银叶粉虱侵染的南瓜品种叶片镀银的发展

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The silverleaf whitefly Bemisia tabaci biotype B is one of the most harmful insect pests for agricultural and vegetable crops. Beside the direct damage, it transmits pathogenic virus and induces plant physiological disorders, such as the squash silverleaf disorder. In this research we evaluated the development of leaf silvering in squash cultivars submitted to artificial infestation of B. tabaci biotype B. An experiment was conducted under field conditions, in Campinas, S?o Paulo State, Brazil, during the season 2003-2004. The germplasm (Cucurbita spp.) comprised of seven cultivars of summer squash and nine of bush squash. The experiment used a complete randomized blocks design, with 16 treatments (cultivars) and five replications. Each plot consisted of two plants. The artificial infestation was done when the plants emitted the third pair of leaves, by transplanting soybean plants infested with silverleaf whitefly between the squash plots. The leaf silvering was evaluated every two or three days, using a rating scale varying from 1 (no symptom) to 5 (leaves completely silvered). The highest level (5.0) was observed in 'Baianinha', 'Golden Delight', 'Caravela' and 'Arlika', while 'Novita' (2.5), 'Atlas' (2.0) and 'Atlanta AG-303' (1.5) showed light symptoms, indicating that these have low sensibility to this physiological disorder.
机译：银叶粉虱烟粉虱（Bemisia tabaci）生物型B是农业和蔬菜作物中最有害的害虫之一。除直接损害外，它还传播病原病毒并诱发植物生理疾病，例如南瓜银叶病。在这项研究中，我们评估了遭受人工烟粉虱生物型B侵害的南瓜品种叶片银化的发展。在田野条件下，于2003-2004年在巴西圣保罗州坎皮纳斯进行了一项实验。种质（南瓜属）由七个西葫芦品种和九个矮生南瓜品种组成。该实验使用了完整的随机区组设计，具有16种处理（品种）和5个重复。每个地块由两棵植物组成。当植物散发出第三对叶子时，是通过在南瓜田间移植感染了银叶粉虱的大豆植物来进行人工侵染。每两到三天评估一次叶片的镀银，其等级等级为1（无症状）至5（叶片完全镀银）。在“ Baianinha”，“ Golden Delight”，“ Caravela”和“ Arlika”中观察到最高水平（5.0），而“ Novita”（2.5），“ Atlas”（2.0）和“ Atlanta AG-303”（1.5）观察到最高水平。表现出轻度的症状，表明这些症状对这种生理疾病的敏感性较低。

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