STUDIES ON THE MICROCLIMATIC FACTORS IN RELATION TO THE OCCURRENCE OF THE RICE PLANT HOPPERS
|Keywords:||稻田小氣候與稻飛蝨發生關係之觀察;STUDIES ON THE MICROCLIMATIC FACTORS IN RELATION TO THE OCCURRENCE OF THE RICE PLANT HOPPERS||Issue Date:||1970||Publisher:||植病保護學會||Journal Volume:||12||Journal Issue:||4||Start page/Pages:||184-189||Source:||植物保護學會會刊||Abstract:||
1. The survey hereby reported was carried out in Taipei in 1969 (2nd crop) and 1970 (1st crop). The air temperature and relative humidity reading were taken at 4 different niches (10, 30, 60 and 90 cm above water surface in the paddy field) between “hills” of the rice plant. For comparison, the rainfall, the air temperature in the open, the water temperature in the field, and the population density of the rice plant hoppers were also kept on record.
2. As a rule, the air temperature between the rice-hills was significantly higher than that in the open, and in generally, the temperature of the air near the water surface and that of the water were slightly- lower than at higher niches. The latter became more significant in the later parts of the growing season, because the rice foliage was then more prolific and formed an effective shade.
3. The relative humidity was highest near the water surface and decreased successively on approaching the open and the top of the rice plant. This phenonienon was particularly apparent in the 2nd crop.
4. Theoretically, the optimum niche for the breeding and multiplication of the rice plant hoppers is at the level of about 10 cm above the water surface, where both the temperature and relative humidity are high and the shade formed by rice foliage is most effective. On the other hand, as a result of accumulating population density of the rice plant hoppers, the outbreaks of these insect pests occurs usually in the 2nd crop.
5. During the two growing seasons under observation, the population density of the rice plant hoppers was very low while that of the egg-parasites, fairly high. It is suggested that further field surveys should be undertaken when the population density of the former is high, and that the population dynamics and ecological requirements of the egg-parasites should be investigated.
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