防城港 2 种红树林虫害与气象条件的关系

为了给红树林虫害的预报和防治提供科学依据，笔者基于2015—2019年防城港市红树林2种典型虫害（广州小斑螟Oligochroa cantonella和柚木肖弄蝶夜蛾Hyblaea puera）的发生面积及气候资料，采用Pearson相关分析法，在月尺度和旬尺度上揭示并对比了影响这两种害虫发生的关键气象因子和影响时段。结果表明:防城港市2种典型虫害的发生均显著受5月下旬(虫害发生期)的温度和相对湿度的影响，其中，广州小斑螟的发生与该时段温度呈负相关，而柚木肖弄蝶夜蛾的发生与该时段的温度呈正相关。此外，虫害发生前期的气象要素也影响其发生程度，广州小斑螟的发生受前期（3月上旬和下旬）相对湿度及风速影响，柚木肖弄蝶夜蛾的发生受前期（2月上旬和下旬）降雨的显著影响。

Relationship between the occurrence of two typical insect pests in mangroves and the climate factors in Fangchenggang,Guangxi

The data on mangrove area under infestation by two typical insect pests, Oligochroa cantonella and Hyblaea puera, in mangroves and the climate data in Fangchenggang in the years from 2015 to 2019 were collected and analyzed by using the Pearson correlation method to reveal and compare the key meteorological factors and the time durations associated with occurrence of these two insect pests on monthly and ten-day scales. The results showed that the occurrence of the two insect pests in the study area was significantly affected by the rainfall and relative humidity in late May (pest occurrence period). O. cantonella occurrence was negatively correlated with the temperature in late May, whereas H. puera occurrence was positively correlated with the temperature in late May. Moreover, the occurrence of O. cantonella was also affected by relative humidity and wind speed in the pre-occurrence periods (early and late March), and the occurrence of H. puera was affected by rainfall in the pre-occurrence periods (early and late February). The relationship between the occurrence of the two pest insects and the meteorological factors in Fangchenggang was then established, which is helpful for forecasting and early warning of occurrence and infestation of pest insects.