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1.
烟粉虱若虫在夏大豆植株上分布的研究 总被引：5，自引：0，他引：5
对烟粉虱若虫在223份不同结荚习性大豆品种植株上的分布进行了调查研究.结果表明烟粉虱若虫在夏大豆植株上的总体分布集中在中上部,占总数的83.1%,中部与上部之间差异不显著.不同结荚习性大豆品种上烟粉虱若虫的分布存在明显差异.有限结荚习性品种主要分布在上部,上4叶烟粉虱数占单株烟粉虱总数的57.7%;无限结荚习性品种主要分布在中上部,第11叶至第16叶上烟粉虱数占单株烟粉虱总数的53.1%;亚有限结荚习性品种中5叶烟粉虱数占单株烟粉虱总数的39.6%,上5叶烟粉虱数占单株烟粉虱总数的41.4%.由此可以看出,化学防治烟粉虱的重点部位是大豆植株的中上部叶片. 相似文献
2.
The morphological basis of resistance to the whiteflyBemisia tabaci Genn. (Aleyrodidae: Hemiptera) was studied. The plant characters examined were leaf area, thickness of leaf lamina, hair
density, hair length, angle of insertion of leaf hair, and density of gossypol glands. Hair density and leaf thickness were
positively correlated with the population ofB. tabaci, and a positive correlation was obtained between the adult whitefly population and gossypol glands on stem internodes. Cotton
genotype USA-22 (sparsely hairy) was found to be more tolerant toB. tabaci than was genotype USA-13 (velvety hairy). The use of thinner and glabrous leaved cotton varieties is suggested to minimize
the whitefly menace in cotton. 相似文献
3.
Katoor S. Usharani Baliji Surendranath Qazi M.R. Haq Varagur G. Malathi 《Journal of General Plant Pathology》2005,71(3):230-237
Yellow mosaic disease (YMD) of legumes endemic to South Asia are caused by begomoviruses transmitted by whiteflies. Based on molecular characterization, two distinct viruses – Mungbean yellow mosaic India virus (MYMIV) and Mungbean yellow mosaic virus (MYMV) – were found previously to be the etiological agents of YMD in legumes. Here, host range studies with a soybean isolate of MYMIV (MYMIV-[Sb]) were carried out by both whitefly transmission and agroinoculation. MYMIV-[Sb] was similar to a cowpea isolate of MYMIV (MYMIV-[Cp]) in its ability to infect cowpea, thus differing from blackgram (MYMIV) and mungbean (MYMIV-[Mg]) isolates, which do not infect cowpea. Genomic analysis of DNA A and DNA B components of these MYMIV isolates show characteristic differences in complete DNA B nucleotide sequence correlating with host range differences. 相似文献
4.
迄今在茶树上发现的粉虱有８种，即：黑刺粉虱Ａｌｅｕｒｏｃａｎｔｈｕｓｓｐｉｎｉｆｅｒｕｓ，杜鹃穴粉虱Ａｌｅｕ－ｒｏｌｏｂｕｓｒｈｏｄｏｄｅｎｄｒｉ，山茶褶粉虱Ａｌｅｕｒｏｔｒａｃｈｅｌｕｓｃａｍｅｌｉａｅ，归亚瘤粉虱Ａｌｅｕｒｏｔｕｂｅｒｃｕｌａｔｕｓｇｕｙａｖａｅ，番石榴瘤粉虱Ａｌｅｕｒｏｔｕｂｅｒｃｕｌａｔｕｓｐｓｉｄｉ，流苏子瘤粉虱Ａｌｅｕｒｏｔｕｂｅｒｃｕｌａｔｕｓｔｈｙｓａｎｏｓｐｅｒ－ｍｉ，桔裸粉虱Ｄｉａｌｅｕｒｏｄｅｓｃｉｔｒｉ，和杨梅类伯粉虱Ｐａｒａｂｅｍｉｓｉａｍｙｒｉｃａｅ。本文对上述８种粉虱的形态、寄主、分布和天敌作了介绍。 相似文献
5.
Yellow mosaic disease (YMD) of black gram is an important production constraint in India. Black gram germplasm, consisting of 344 accessions, originally collected from different geographic regions of India and conserved in National Gene Bank at National Bureau of Plant Genetic Resources, India, were evaluated for their response against YMD. None of the accessions tested was found to be immune, however, considerable variation in disease response was observed among them. Of the 344 accessions, 32 showed resistance in the field during the rainy season (June–September) 2010 as assessed by coefficient of infection (CI) and area under disease progress curve (AUDPC). These accessions were re-evaluated during rainy season (June–September) 2011 and 2012 for their disease resistance along with yield-associated characters. Eight accessions that exhibited consistently highly resistant (HR) or resistant (R) reaction (CI ≤ 9) along with lower AUDPC value (≤650), were further evaluated following inoculation with whiteflies or via agroinoculation. Along with the resistant trait, these eight accessions were also found either similar or even better in their yield potential as compared to check. After artificial inoculation using viruliferous whiteflies under glasshouse, of the eight field-resistant accessions, response of two (IC144901 and IC001572) were categorized as HR as <10% plants exhibited minute yellow specks after 17–22 dpi. Two accessions viz. IC011613 and IC485638 showed <20% incidence with bright yellow specks or spots after 15–20 dpi and were grouped into R category. The resistance of these four accessions was further confirmed through agroinoculation of the infectious cloned viral DNA under controlled conditions. In resistant accessions low accumulation of viral DNA was observed over a period of time. These four accessions could be used in future breeding programmes to develop black gram cultivars resistant to YMD or could be used directly as varieties to manage YMD after adaption to various agro-climatic regions. 相似文献
6.
在西宁地区一品红种植中,选用2.0%EC阿维菌素,1000倍液,40%EC立螨思2000倍液,5%EC吡虫啉800倍液均能有效控制白粉虱对一品红的为害,且持效期长。其中40%EC立螨思2000倍液的防效最佳。 相似文献
7.
为明确衡水地区日光温室粉虱发生规律,将温室南北向分为北面、中间、南面3个方位,沿东西向分成6段,2011年11月15日～2012年6月15日对越冬番茄整个生长季温室内不同位置的粉虱成虫发生数量进行了调查。结果表明：2011年11月15日～12月2日粉虱成虫数量由0.8头/株增长到3.1头/株,2012年3月1日～4月1日粉虱成虫数量升至3.1头/株;整个番茄生长期共调查11次,其中,南北向上有9次为北面单株粉虱数量显著高于中间和南面,东西向上不同段的单株粉虱数量有4次无显著差异、7次差异达到了显著水平（4次中间段高、2次西端高、1次东端高）。衡水日光温室粉虱成虫数量存在2个增长期,其中第1个在定植7d后、第2个在年后3月;整个生长期温室粉虱成虫分布呈北面高于南面的趋势,东西向无明显规律。 相似文献
8.
控制粉虱类害虫虫生真菌的应用研究 总被引：1，自引：0，他引：1
粉虱类害虫在保护地和大田园林作物上发生日益猖獗,造成严重的经济损失。其抗药性增强,化学防治难以奏效。利用虫生真菌及其代谢产物进行防治是未来粉虱害虫防治的主要途径。本文综述了近几年国内外有关虫生真菌在控制粉虱类害虫中的应用研究。 相似文献
9.
Combating viral mosaic disease of cassava in the Lake Zone of Tanzania by intercropping with legumes
Cassava (Manihot esculenta Crantz) production is constrained by many factors, including the viral cassava mosaic disease (CMD). This study was conducted to explore the potential of intercropping cassava with legumes to reduce CMD effects on cassava production. Local (Lyongo Kwimba) and improved (Suma) cassava varieties were intercropped with three types of grain legumes (groundnut, Arachis hypogea L. var. Upendo; cowpea, Vigna unguiculata (L.) Walp. var. Vuli; and green gram, Vigna radiata (L.) R. Wilczek var. Imara). Monocrops of cassava with and without NPK fertilizer were included as controls. The experiment was established using a randomized complete block design with four replications in a split-plot arrangement for three seasons. Cassava varieties intercropped with cowpeas, green gram, and groundnuts and cassava monocrops with and without NPK fertilizer constituted the main plot and sub-plots, respectively. Whitefly population counts and CMD severity and incidence were measured at regular intervals. Cropping system had a significant effect (P < 0.05) on whitefly populations and CMD severity. Small whitefly populations (0–7.5 individuals per leaf) and low CMD severity (1–2.4 on a 5-point scale) were recorded in improved and local cassava varieties intercropped with green gram. The local cassava variety intercropped with green gram showed low CMD incidences (0%–40%) in all seasons. Generally, growing cassava with green gram proved effective in reducing whitefly populations and CMD incidence and severity. Intercropping cassava with grain legumes may improve cassava production and food security in CMD-prone areas of the Lake Zone of Tanzania and areas with similar environments. 相似文献
10.
The whitefly Bemisia
tabaci (Gennadius) has caused notable damage to vegetable and cotton crops in the eastern Mediterranean region since about 1994, and has become particularly problematic in southern Turkey beginning in 2000. The development of squash silverleaf symptoms in Cucurbita species and the unprecedented high population levels in the region suggested that the B biotype, notable for the latter phenotypes, had been introduced. To test this hypothesis and determine the host distribution of the suspect introduced B biotype and its associated natural enemies, B. tabaci immature instars and adults, and the associated natural enemies were collected from cultivated and uncultivated plant species. From the southern Turkey collections, B. tabaci was found to colonize 152 species from 43 plant families. Of the plant species upon which B. tabaci was found to reproduce, 152 of them were reported as hosts of B. tabaci in Turkey. Five species of predators and two species of parasitoids were identified as natural enemies of the B biotype of B. tabaci in southern Turkey. Using the mitochondrial cytochrome oxidase I gene all B. tabaci were identified as the B biotype of the B. tabaci complex, at 96–100% shared identity with reference B biotype sequences. Results indicate that this invasive biotype has displaced the local Turkey-cotton haplotype that was known to occur previously in southern Turkey. 相似文献