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Field-Based, Degree-Day Model for Spiny Bollworm Earis Insulana Development

A. A. Hamed Amin and M. E. Foda


 
ABSTRACT

Field studies were conducted throughout 1996 and 1997 in Fayoum Governorate to analyze the population size of spiny bollworm, Earis insulana using delta pheromone traps. Field generation numbers were calculated. Life table parameters for field data were constructed. Thermal requirements and heat unit's accumulation were used. Earis insulana was found to have 7-8 field generation a year. Generations occurred at an average of 436.8 DD's above threshold of 11.6 oC.



Reprinted from Proceedings of the 1999 Beltwide Cotton Conferences pp. 923 - 925
©National Cotton Council, Memphis TN

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Document last modified Monday, Jun 21 1999