本文翻譯貴田武捷與小早川利次在1941年發表於台灣農事報的雜草物候學相關調查報告。原著調查並表列台北地方145種雜草的開花結實月份，發現以開花而言，春（3-6月）秋（9-10月）兩季是開花的旺盛期，較少開花的是夏（7-8月）與冬（11-2月）兩季；以結實而言，6月到8月為最盛期，9月、10月次之，最少的是冬季12、1、2月。

This article is a translation of a Japanese paper "Studies on the management of weeds. I. Flowering and fruiting period of weeds that appeared in Taipei", which was published at Formosa Agricultural Review, 37(8): 613-629. The authors were Taketosi Katada and Tositugu Kobayakawa. Phenology of 145 weeds in the experimental farms of now the National Taiwan University was recorded and tabled. It appeared that the flowering periods prevailed at spring and autumn seasons. Less species flowered at summer or winter seasons. The fruiting periods prevailed during June to August, followed by September and October, scant during December to February.