Determination of the population densities of different development stags of Sawtoothed beetle Oryzaephilus surinamensis L. in Date fruit )Sayer cultivar( bausing spectrophotometry method

Subject Areas : entomology and othea arthropods

M. Latifian ¹ (Institute of date palm and tropical fruits, Ahwaz, Iran)
B. Rad ² (Research Institute of date palm and tropical fruits, Ahwaz, Iran)

Received: 2012-08-10 Accepted : 2013-10-23 Published : 2015-02-20

Keywords:

Abstract :

This project was conducted to estimate population densities of Oryzaephilus surinamensis in Sayer date palm cultivar based on Spectrophotometer. Results showed that the wave length of maximum absorption for the developmental stages of the egg, larva, pupa and adult of O. surinamensis in Sayer Cultivar were 1214, 1223, 1216. Based on these results spectrophotometer is a perfect method to detect the different growth stages of Sawtoothed beetle on studied cultivar. All regression coefficients of modeles were higher than 0.5 in dicating a suitalle fittling the modeles to data .two samples of llo g was enough for proper evaluation of densities of different stages of O. surinamensis in stored date fruts RV values for four stages were 9.3,3.3,3./and 9.5. The relative variatians (RV) for four life stages of the pest were calculated 22.47,15.31,15.85 and 19.81 respectively.since in allcoses RVand RNPwere respectively lower than loand 25,the spectrophotometry could be used in applied and research works.