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1962—1963年,在湘南、湖中、湘东和湘西等山区调查,得知湖南省水稻三化螟垂直分布最高为海拔1,025米。但不同山系的最高分布不一,一般都止于海拔800米以下。气候因素是影响垂直分布的主导因素。 从湖南省三化螟的平面分布看来,它的踪迹遍及全省,但根据它们的发生动态,可划分为五个发生区:(1)第3—4代经常猖獗区:(2)第3—4代间歇猖獗区:(3)第3代经常猖獗区;(4)第3代间歇猖獗区:(5)轻微发生区。我们认为,水稻种植制度和气候条件是左右平面分布猖獗程度的因素。 讨论了三化螟的预测预报和大田防治应有重点,在海拔700米以上地区,不必进行;400—700米的地区,视种植制度复杂与否来决定;400米以下地区,若双季稻或迟熟中稻面积较大,则必须着重进行。猖獗区要注意防治,轻微区要总结原因,找出根治螟害的途径。
From 1962 to 1963, surveys in southern Hunan, Hunan, eastern Hunan and western Hunan showed that the highest vertical distribution of rice stem borer in Hunan was 1,025 meters above sea level. However, the highest distribution of different mountain systems generally stop at an altitude of 800 meters below. Climatic factors are the dominant factors affecting the vertical distribution. According to the planar distribution of the rice stem borer, Hunan Province, it traces all over the province, but according to their dynamics, it can be divided into five occurrence areas: (1) The thirteenth generation is often rampant area: (2) 3-4 generations of intermittent rampant area: (3) the third generation is often rampant area; (4) third-generation intermittent rampant area: (5) minor occurrence area. In our opinion, the rice planting system and climatic conditions are the factors influencing the degree of distribution of left and right plains. Discussed the forecast and prediction of rice stem borer should be the focus of field control, at an altitude of 700 meters above the area need not be carried out; 400-700 m area, depending on the complexity of the planting system to decide; 400 meters below the area, if double cropping rice Or late maturing medium-sized rice area, you must focus. The rampant area should pay attention to prevention and treatment, and the slight area should summarize the reasons and find out the ways to cure the stem borer damage.