Virulence of the Populations of the Whitebacked Planthopper, Sogatella furcifera Reared on Different Resistant Rice Varieties

ARC and ND colony were obtained by rearing the whitebacked planthopper (WBPH), Sogatella furcifera(Horvath), exclusively on ARC10239 (ARC, carrying resistance gene Wbph2) and N‘Diang Marie (ND, carrying resistance gene WbphS) till 15 generations. Taichung Native 1 (TN1) and Rathu Heenati (RHT) served as susceptible and resistant check, respectively. The results of electronic recording revealed that duration of salivation and X-waveform of the two colonies on their corresponding hosts was short while the duration of phloem ingestion was long. The amount of honeydew excreted by ARC and ND colony did not differ on their corresponding host varieties from TN1 and was much higher than that of RHT. The number of eggs laid on their host varieties and TN1 were significantly higher than that on RHT. No distinct change was observed for these two colonies in term of percentage of developed eggs. The nymph survival rate of ND colony on its selection host was 45.0%, significantly different from that on TN1(71.4%0) and RHT(21.0%), while that of ARCcolony was 68. 3%, not significantly different from that on TN1(77.5%), but much higher than that on RHT(22.6%).The nymphal development duration of these two colonies on the corresponding hosts was not different from that on TN1, but significantly shorter than that on RHT. In brief, these two colonies had almost adapted to their corresponding host varieties based on feeding and oviposition, but the nymphal survival rate of ND colony was still low.     

白背飞虱种群密度效应的研究

本研究证明白背飞虱卵期不存在密度效应,卵孵化率平均为86.58％;若虫、成虫期密度效应明显,随着密度增加,若虫存活率、成虫产卵量和寿命呈幂函数曲线下降。     

基于卷积神经网络的白背飞虱识别方法

为了实现白背飞虱虫情信息的自动收集和监测,提出一种基于卷积神经网络的白背飞虱识别方法并进行应用研究。首先,用改进的野外环境昆虫图像自动采集装置,采集田间自然状态下的白背飞虱图像,对所获取的图像进行归一化处理。然后,随机选取1/2图像样本作为训练集、1/4作为测试集。利用5×5卷积核对训练样本进行卷积操作,将所获取的特征图以2×2邻域进行池化操作。再次经过卷积操作和3×3邻域池化操作后,通过自动学习获取网络模型参数和确定网络模型参数,得到白背飞虱的最佳网络识别模型。试验结果显示,利用训练后的网络识别模型,对训练集白背飞虱的识别正确率可达96.17%,对测试集白背飞虱的识别正确率为94.14%。     

水稻叶鞘氨基酸与白背飞虱危害的关系研究

本文运用回归、相关和通径分析,剖析了16种氨基酸对白背飞虱Sogatella furcifera(Horvath)危害的关系。找出了38种与抗虫性有关的主效氨基酸。不同抗虫品种的诱食和抑食主效氨基酸比值区间为:高抗虫品种小于0.6,中抗虫品种为0.7—1,感虫品种大于1。凡抗性越强的品种,其比值越小;反之越大。     

Differential Expression of Whitebacked Planthopper Resistance in the japonica/indica Doubled Haploid Rice Population under Field Evaluation and Seedbox Screening Test

Whitebacked planthopper (WBPH) -resistance in a japonica / indica doubled haploid (DH) rice population established from a cross between WBPH-resistant japonica Chun]iang 06 and susceptible indica TN1, was comparatively evaluated through a field experiment based on the WBPH immigrant density and standardized seedbox screening test (SSST). All the susceptible DH lines in the field experiment behaved accordingly in SSST. However, 35 of resistant 66 lines (53%) in the field, were categorized to susceptible groups in SSST. Likewise, there were no significant differences in WBPH immigrant densities among 70 DH lines that were highly resistant to susceptible in SSST. The results revealed that SSST could not evaluate properly WBPH resistance in the DH lines. Four QTLs for WBPH-resistance phenotyped by the immigrant density were detected on chromosomes 2, 3, 4, and 11. Of them, the QTL on chromosome 4 was the most effective (LOD 21.8, variance 78%). Five QTLs associated with seedling mortality were mapped on chromosomes 2, 3, 4, 5 and 6. In addition to the QTL (LOD 10.5, variance 68%) on chromosome 4, there was another major QTL (LOD 12.7, variance 71%) located on chromosome 5, which was SSST-specific but might be irrespective of the WBPH resistance traits.     

水稻广亲和品种抗白背飞虱的研究

采用苗期群体筛选鉴定法、蜜露量测定和产卵与卵孵化率测定等方法,就18个水稻广亲和品种对白背飞虱抗性表现进行了研究.筛选出5个对白背飞虱无拒取食作用和杀卵作用的水稻广亲和品种Aus371、02428、Labelle、Copslo和玉92秋14.     

不同类型水稻品种对白背飞虱忌避性、抗生性和耐害性的测定

 研究了19个不同类型的水稻品种对白背飞虱的忌避性、抗生性和耐害性的测定。4个粳稻品种(91-17、丙90-98、丙850和丙93-63对成虫表现出较强的忌避性,丙93-63对白背飞虱产卵具有明显的忌避性。协优9308和春江06对白背飞虱的抗生性最强,协优413对白背飞虱具有一定的抗性。     

第3代白背飞虱发生虫量及发生期预测模型

对贵州省余庆县1993--2007年白背飞虱测报资料进行筛选分析,建立了第3代白背飞虱发生虫量预测模型(I):y=430.2589 76.3021x1 3.0216 x2 0.014 3x3士Sy/12=1802.71;第3代低龄若虫盛发期预测模型(Ⅱ):y=4.6259 0.5238x士Sy/比x=1.804 6;第3代1龄若虫盛发期预测模型(Ⅲ):y=3.8994 1.8346x士Sy=1.3506.利用其回归模型对第3代白背飞虱发生虫量和低龄若虫盛发期进行预测,方法简便,结果较为准确,可以提前10～15d作出预报.2008年6月应用模型进行预报,发生实况与预报结果相吻合.     

广西不同白背飞虱种群对杀虫剂的敏感性测定

用稻茎浸渍法测定了广西不同白背飞虱种群对4种杀虫剂的敏感性。结果表明,不同白背飞虱种群对噻虫嗪的敏感性最高,LC50值在0．0526-0．3161mga.i./L之间;对吡虫啉也有较高的敏感性,LC50在0．0932-0．7646mga．i．／L之间;对噻嗪酮和氟虫腈的敏感性相对较低,LC50值在0．1951-2．7259mga．i．／L之间。不同白背飞虱种群对同一种杀虫剂的敏感性差异很大,对氟虫腈和吡虫啉的敏感性差异超过8倍,对噻嗪酮和噻虫嗪的敏感性差异达5～6倍。