Abstract
The present study was carried out under fourconstant temperatures (20, 25, 30 and 35°C each ± 1°C) when the Pink Bollworm, Pectinophoragossypiella (Saund.) larvae,were fed on artificial diet. The timerequired for embryogensis, larval duration and pupal duration decreased as thetemperatures increased from 20 to 35°C. The lower thresholds of development (t0)were 9.91, 14.07, 9.57 and 12.18°C for eggs, larvae, pupae and pre-ovipositionperiod, respectively. The average accumulated heat units required fordevelopment was 72.11, 166.38, 248.70 and 26.83degree-days for egg, larvae,pupae and pre-oviposition period, respectively. The lower threshold ofdevelopment (t0) to complete a generation was 12.03°C. The averageaccumulated heat units required for a generation was 499.71 degree-days. Thekind of food had non-significant effect for heat requirements. The thermalunits required to complete the development of different stages to complete onegeneration, as well as helping in the design of development indexes,determining the times required for these stages under fluctuating temperaturesin field and forecasting system for establishment and develop the non chemicalmethods for the pink bollworm IPM program.
Highlights
Cotton is one of the major economic crops in Egypt
The most of yield and quality losses are caused by insect pests, specially the pink bollworm, Pectinophora gossypiella (Saund.) as it attack the fruiting part
The same Table showed that the average thermal units required for eggs development till hatching was 72.11 Degree Days (DDs)'s as determined by the thermal summation equation K= y (T-9.91)
Summary
Cotton is one of the major economic crops in Egypt. The most of yield and quality losses are caused by insect pests, specially the pink bollworm, Pectinophora gossypiella (Saund.) as it attack the fruiting part (squares, flowers and green bolls).Wagner et al, (1984) described the developmental rates as a function of temperature. All the P. gossypiella stages were kept under four constant temperatures (20, 25, 30 and 35 °C) to determine the rate of development.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Egyptian Academic Journal of Biological Sciences. A, Entomology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
