The distribution region and the distributive temperature and humidity threshold of osier weevil in China

Abstract

A distribution map of osier weevil (Crytorrynchus lapathi L.) was drown up based on widely collecting information and field survey. The results showed that Osier weevil has a widespread in China, stretching from 33°21’ to 51°42’ N latitude and 83°00’ to 132°58’ E longitude, and distributes in forms of big or small patches or sports uncontinously. According to the analysis of meteorological data, the temperature and humidity threshold for osier weevil’ s distribution were determined by methods of PCA (Principle Component Analysis) and RA(Relativity Analysis): January temperature is -30∼ 0°C. Annual temperature -4∼13°C, Annual precipitation from 411∼ 1,136 mm. The areas with January temperature under 0°C., annual temperature above 0°C and annual precipitation of 400∼ 800 mm are the optimum distributing places for osier weevil in China.