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DEGREE-DAYS REQUIREMENT FOR EGG HATCHING AND ADULT EMERGENCE OF DUBAS BUG Ommatissus lybicus DE BERG (HOMOPTERA: TROPIDUCHIDAE) UNDER FIELD CONDITIONS OF MIDDLE OF IRAQ | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 14, Issue 3, 2009, Pages 0-0 | ||
| Authors | ||
| B. H. Hassan; H. F. Alrubeai; I. J. AlJboory | ||
| Abstract | ||
| The computer program SUBROUTIN D-DAY was used for calculating degree-days requirement for the initial egg hatching,various hatching percentages and first adult emergence of dubas bug Ommatissus lybicus De Berg. under the prevailing field conditions of middle of Iraq (Baghdad) for both Spring and Autumn generations of the dubas bug in 2002 in order to establish an effective forecasting system depending on thermal units (degree-days) to determine optimum spraying timing. The results indicated that the DDs required for the initial egg hatching was 170,68 ± 11,47 and 2167.07 ± 67.35 for Spring and Autumn generations, respectively. The average DDs required for first adult emergence was 691.58 ± 20.45 for Spring generation and 3064.58 ± 121.40 for Autumn generation. The results also showed that the DDs required for eggs hatching of 10,30,50,70 and 90% were 241.87 20.07 ,411.89 26.86, 552.2 20.37, 690.28 34.66 and 922.00 40.39 for Spring generation and 2383.8 37.39, 2760.48 53.68, 3131.63 38.19 ,3328.86 44.08 and 3424.00 51.37 for Autumn generation | ||
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