BIOLOGICAL CONTROL OF THE HONEYDEW MOTH, CRYPTOBLABES GNIDIELLA MILL. IN GRAPE ORCHARDS USING THE LOCAL EGG PARASITOID,TRICHOGRAMMA EVANESCENS WEST. AND AGERIN ( BACILLUS THURINGIENSIS) AS COMPARED WITH RECOMMENDED INSECTICIDES IN MIDDLE EGYPT. | ||||
| Assiut Journal of Agricultural Sciences | ||||
| Article 11, Volume 38, Issue 2, October 2007, Page 93-111 PDF (564.7 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajas.2007.270997 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| T.H Tohamy,; A. A. Abd El- Raheem; M. I.El Khouly | ||||
| Plant Protection Research institute, Agric. Res. Center, Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| The role of inunudation by the egg parasitoid , Trichogramma evanescens West alone and combined with Agerin (Bacillus thuringiensis ) compared with recommended insecticides(Relidan and Somithion ) was evaluated against the honeydew moth (HDM) Cryptoblabes gnidiella Mill. infesting grape orchards in Mina region during two successive seasons of (2006 and 2007) .The results obtained showed that the highest general percentage of parasitism on HDM eggs was observed in grape orchard treated with egg parasitoid and Agerin (B.t.) together followed with those treated with only egg parasitoid, while it was nil in those treated with insecticides and untreated areas (control). Also spraying insecticides in grape orchard significant reduced the number of predators compared with the other two treatments. Furthermore , the release of the egg parasitoid plus spraying Agerin (B.t.) in grape orchards demonstrate the highest general mean percent reduction in infestation by C. gnidiella (67.65 and 68.99 %) followed with 63.39 and 44.56 % reduction in grape orchards treated with insecticides and 59.35 and 44.78 % reduction in those treated with the egg parasitoid alone compared to the untreated orchard in both years seasons, respectively. The statistical analysis showed significant difference between the effectiveness of the three tested control methods in reducing damage by this pest. Also, the costs of honeydew moth control compared with chemical treatments were reduced by 41.1% and 62.5 % in grape trees treated with egg- parasitoid combined with Agerin (B.t.) and only egg parasitoid , respectively. On the other hand, the percentage of increasing in grape fruit yield/tree was significantly higher in the grape orchards treated with egg parasitoid plus Agerin than (27.43 and 29.09 %) in those treated with egg parasitoid alone (21.90 and 22.77 %) and insecticides (25.45 and 24.27%) compared to the control ones in both seasons, respectively. These results seems to be of great significance when planning for control program against this pest. | ||||
| Keywords | ||||
| Biological control; Cryptoblabes gnidiella Mill; grape orchard; Trichogramma evanescens West; Bacillus thuringiensis; insecticides; middle Egypt | ||||
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