Study of Lesser Date Moth infestation and economic losses on Date palm cvs. Sayer and Halawy

Mahdi Mezeal, Mohammed; Adnan Al-yousif, Aquil

	Study of Lesser Date Moth infestation and economic losses on Date palm cvs. Sayer and Halawy
Basrah Journal For Date Palm Research
Article 1, Volume 7, Issue 2, 2008, Pages 82-92 PDF (0 K)
Authors
Mohammed Mahdi Mezeal; Aquil Adnan Al-yousif
Abstract
The infestation percentage of Lesser Date Moth Batrachedra amydraula Meyrick (Cosmopterygidae : Lepidoptera ) and economic losses were studied on Date palm Phoenix dectylifera L. cvs. Sayer and Halawy throughout the fruiting season 2007 in Shatt-Alarab region Basrah. The results elucidated that infestation with B. amydraula on both cultivars of palm started at the beginning of fruit development stage Hebabok , infestation percentage were 4.75rand 0.5% respectively at the first week of May . Infestation rate increased rapidly, and reached a maximum percentage of 67% at the first week of June, at the end of the Hebabok stage of cv. Sayer . While the highest percentage 64.5% was recorded at the end of fruit development stage Chemerii of cv. Halawy , at the end of the third week of June . The infestation with insect disappeared on khelal stage of Sayer cultivar at the beginning of the forth week of July . While the infestation on khelal stage of Halawy cultivar disappeared at the end of second week of July. The results showed that the average number of fruits per Sayer tree were 7243.75 after fruit set at the forth week of April and became 2711.25 fruit / tree (total yield 22.59 Kg) at the forth week of July, because the number of fallen fruits were 4532.5 fruit/ tree (37.77 Kg) , which included 1012.5 infested fruit/ tree (8.43Kg ), whereas that average number of fruits per Halawy tree were 5416.25 fruit /tree at the beginning of the forth week of April and became 2231.5 fruit / tree ( total yield 17.52 Kg ) at the second week of July, and found that the number of fallen fruits 3184.75 fruit /tree (25.01Kg), which included 381 infested fruit /tree (2.99Kg) , for that The infestation with B. amydraula on both cultivars Sayer and Halawy caused economic losses , reached 27.19 and 14.58% respectively .

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