IMPLEMENTATION OF THRESHOLD OF DEVELOPMENT AND DAY DEGREE UNITS WHEN INTEGRATED PEST PROGRAMMES OF CITRUS LEAF MINER, PHYLLOCNISTIS CITRELLA STAIN ARE CONSIDERED

EL SAADANY, GAMIL B.; ABDEL-WAHED, MOHAMED S.; DRAZ, KHALIL A. A.; SABRY, HATEM M.; SHAMSAN, ABDEL-HAKIM D.

doi:10.21608/ejar.2002.311899

IMPLEMENTATION OF THRESHOLD OF DEVELOPMENT AND DAY DEGREE UNITS WHEN INTEGRATED PEST PROGRAMMES OF CITRUS LEAF MINER, PHYLLOCNISTIS CITRELLA STAIN ARE CONSIDERED

Document Type : Original Article

Authors

¹ Plant Protection Department, Faculty of Agriculture, Ain Shams University, Cairo, Egypt

² Plant Protection Department, Faculty of Agriculture, Alexandria University, Damanhour, Egypt.

³ Central Agricultural Pesticides Laboratory, Agricultural Research Centre, Dokki, Giza, Egypt.

10.21608/ejar.2002.311899

Abstract

A simple method of estimating accumulated thermal units was adopted; utilizing daily mean temperature. The threshold rates of development of citrus leaf miner stages viz. egg, larva, pre-pupa, pupa and adult on 4 constant temperatures (15. 20, 25 and 30C) were estimated. The bio feature parameters decreased with the increase in the corresponding temperature. The total life span duration varied greatly between 127.1, 53.7, 24.7 and 22.2 days at 15, 20, 25 and 30C, respectively. The target instars reared in both laboratory temperature (26.3-±-2C) and green house temperature (24.1±3°C) showed that the total life span was 25.8 and 27.1 days, respectively. The estimated zero figures of development for eggs, larvae, pre pupae, pupae and adults were 7.5, 12.6, 10.7, 12.7, and 11.90, respectively with general mean 11.1°C. The accumulated thermal units needed for completing one generation was 398.29 DD units.