Effect of Leaf Pinaes Chemical Composition of Different Date Palm Cultivar on Infection by Whit Scale Insect  Parlatoria blanchardii Targ.  (Homoptera: Coccinea : Diaspidae)

	Effect of Leaf Pinaes Chemical Composition of Different Date Palm Cultivar on Infection by Whit Scale Insect Parlatoria blanchardii Targ. (Homoptera: Coccinea : Diaspidae)
Magazine of Al-Kufa University for Biology
Article 1, Volume 1, Issue 2, 2009, Pages 171-181
Abstract
A study was conducted during 2006-2007 season to find the effect of leaf pinaes chemical composition of five date Palm cultivars( Barhu, Hillawi, Khadrawi, and Sayer) on the infection Parlatoria blanchardii Targ. Cultivars content of chlorophyll, carotene, kitine, wax, and phenolic compounds were calculated and the spread of that insect was studied at five locations in Basrah province which were: Abualkhasib, Shat Alarab, Fayhaa, Garmat Ali, and, Hartha. Results indicated that the highest percent and severity of infection at 2007 season was 23.25% and 3.61 insect/cm2, respectively, compared with 2006 season where, the percent and severity of infection was low which was 21.21% and 2.82 insect/cm2, respectively. Khadrawi cultivar had the lowest percent and severity of infection 10.67% and, 1.88 insect/cm2, respectively, whereas Hillawi cultivar had the highest percent and severity of infection 28.14% and 4.77 insect/cm2, respectively. A negative correlation were found between severity of infection by the insect and leaf content of chlorophyll, kitin, wax, and phenolic compounds which were(r=-0.914, -0.979, -0.986, -0.931), respectively. The severity of infection did not affected by leaf content of caroten. Percent and severity of infection was lower at Hartha region 12.23% and 1.45 insect/cm2, respectively, where, Abualkhasib had the highest infection it was 33.54% and 5.25 insect/cm2, respectively.

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