Metwally, S., Youssef, A. (2002). SOME BIOLOGICAL AND ECOLOGICAL STUDIES ON THE DATE-STONE PALM BEETLE, Coccotrypes dacty/iperda F. (COL., SCOl YTIDAE). Journal of Plant Protection and Pathology, 27(2), 1247-1253. doi: 10.21608/jppp.2002.253395
S. M. Metwally; Asmhan E. Youssef. "SOME BIOLOGICAL AND ECOLOGICAL STUDIES ON THE DATE-STONE PALM BEETLE, Coccotrypes dacty/iperda F. (COL., SCOl YTIDAE)". Journal of Plant Protection and Pathology, 27, 2, 2002, 1247-1253. doi: 10.21608/jppp.2002.253395
Metwally, S., Youssef, A. (2002). 'SOME BIOLOGICAL AND ECOLOGICAL STUDIES ON THE DATE-STONE PALM BEETLE, Coccotrypes dacty/iperda F. (COL., SCOl YTIDAE)', Journal of Plant Protection and Pathology, 27(2), pp. 1247-1253. doi: 10.21608/jppp.2002.253395
Metwally, S., Youssef, A. SOME BIOLOGICAL AND ECOLOGICAL STUDIES ON THE DATE-STONE PALM BEETLE, Coccotrypes dacty/iperda F. (COL., SCOl YTIDAE). Journal of Plant Protection and Pathology, 2002; 27(2): 1247-1253. doi: 10.21608/jppp.2002.253395
SOME BIOLOGICAL AND ECOLOGICAL STUDIES ON THE DATE-STONE PALM BEETLE, Coccotrypes dacty/iperda F. (COL., SCOl YTIDAE)
Dept. of Economic Entomology, Fac. Agric., Kafr EI-Sheikh, Tanta Univ.
Abstract
Laboratory and field studies on the date stone palm beetle, Coccotrypes dactyliperda (F.) were conducted at Kafr EI-Sheikh governorate, during 2000 and 2001 seasons. The obtained results indicated that food type had highly significant effects on all the tested biological aspects of C. dactyliperda.
Date fruits are more sensitive to attack by C. dactyliperda beetles than date stones. It provides higher survival rate shorter developmental periods and large growth index values. Specific stage survival among the different developmental stages (egg, larvae, pupa and adults) indicated that larval and pupal stages approved to be the main sensitive stage for food types
As for field studies, results showed that fruits thinning had a significant effect on infestation rates. The infestation percentages were, 16.8, 16.2, 18.3 and 17.6% of fallen fruits under trees with fruits thinning rates 20 and 30% were less than those under trees without fruits thinning (26.8 and 31.2%), during 2000 and 2001 seasons, respectively. Data revealed also that fruits thinning had a significant effect on date fruits properties, fruit weight and fruit length, were 11.4 (g), & 3.47 (ern) and 15.97 (g) & 4.26 (cm) for fruits taken from treated and untreated palm trees, respectively. So the fruits thinning system could be a very useful mean for date protection and production.
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