スイトウセンチュウの生態に関する研究 第2報 : 幼苗にたいする遊出センチュウの加害能力と株間移動寄生
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概要
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In the previous report the authors concluded that swimming away of rice nematodes from the seed is related to the temperature and the budding of the seed soaked in the water. The present paper deals with the fluctuation of survival percentage of swimming nematodes, their ability of injuring the rice plant and the movement from injured hill to normal hill in the seedling stage. Most of these studies were conducted using the experiment pot in the sun shine and the difference of plant growth and the stems injured by the said swimmings were surveyed in each growing stage of the plant. But the population in the unhulled rice was observed under a binocular microscope within about one month after the harvest. The results obtained are as follows; 1. The survival percentage of swimming nematodes was related to the period of time after swimming away from the seed soaked in the water and the longer the time becames, the lower was the survival percentage in each experiment temperature of 20-25℃, 25℃ and 30℃. It is supposed that some higher survivals in the seed-bed may occur because the temperature in natural seed-bed is lower than in this experiment. 2. The number of injured stems tends to decrease somewhat with the elapse of days from swimming away till its parasitic time, although it was not distinguished within four days. This tendendy which was observed on the population in unhulled rice seemed to be rather clear. 3. It was considered that swimming nematodes did not attack the young root of the seedling, according to the results of the test in which only the root was dipped into the water in which a large population of the swimmings were contained. Therefore, it was supposed that the swimming nematodes attacked the other parts of the seedling except the root. 4. When injured seedlings and normal ones were mix-planted, injury in normal seedlings was recognized in the same degree as the injured ones, therefore it was considered that the swimmings moved actively from hills to hills. Moreover the movement between hills was related with the nitrogenous manure and in the twice-N fertilized group its movement reached to the maximum at the 1st leaf-stage of the seedlings, although in the normal group at the 3rd-4th leaf-stages.
- 日本生態学会の論文
- 1958-04-30
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