论文部分内容阅读
1989年在美国佛州柑桔研究教育中心开展了桔盾蚧初龄若虫活动行为的研究。试验结果表明;光照强度在初龄若虫爬行定向上起重要作用。在人工光照条件下(光强<1.5×10~2lx),初龄若虫明显趋光,而在自然光下(光强>2.8×10~4lx),初龄若虫即避光,在试验果实向阳部分的初龄若虫的定着率随光强的增加而下降,其线性回归式为:y=56.40-4.63x,得出50％爬虫避光的阈值为1.38×10~4lx。重力对初龄若虫在枝条上的分布范围有影响,但对定着率无显著影响。田间初龄若虫活动时间的观察结果显示:在晴朗天气条件下活动高峰期出现在午间12点钟左右,因而认为在傍午或午间喷施农药可能获得较高的防治效果。田间的日照强度与初龄若虫的活动数量明显相关,而温、湿度和树下光照则未见到有显著影响作用。桔盾蚧初龄若虫在叶片上的定着率显著低于枝条,叶面和叶背相比,叶背显著高于叶面,对枝条的不同部位,初龄若虫的定着嗜好没有差异。另外,雌雄初龄若虫在爬行轨道和爬行速度上有明显差异。以此可用于区分初龄若虫的性别。
1989 Citrus Research and Education Center, Florida, USA conducted a study on the activity of the first instar nymphs. The experimental results show that the light intensity plays an important role in the crawling orientation of the first instar nymphs. In the artificial light conditions (light intensity <1.5 × 10 ~ 2lx), the first instar nymphs significantly phototaxis, and in natural light (light intensity> 2.8 × 10 ~ 4lx), the first instar nymphal is dark, The initial regression rate of nymphs decreased with the increase of light intensity. The linear regression equation was: y = 56.40-4.63x, which indicated that the threshold of 50% reptile sheltering was 1.38 × 10 ~ 4lx. Gravity on the first instar nymphs in the distribution of branches have an impact, but no significant effect on the fixed rate. Observations on the activity time of nymphs at the first instar of the field showed that the activity peak appeared at about 12 o’clock midday under clear weather conditions, which indicated that spraying pesticides at midday or midday may achieve a higher control effect. The sunshine intensity in the field was significantly correlated with the number of activities of the first instar nymphs, while the temperature, humidity and lighting under the tree had no significant effect. Juvenile Nymphoides nobilis on the leaves of the fixed rate was significantly lower than the branches, leaves and leaf back, leaf back was significantly higher than the foliage, the branches of different parts of the first instar nymphs habitat no difference. In addition, the first male and female nymphs in crawling orbital crawling speed and significant differences. This can be used to distinguish the gender of the first instar nymphs.