Effect of Some Local Plants Extracts on Control of the African Bollworm, Helicoverpa armigera (Noctuidae) in Tomatos أثر بعض المستخلصات المحلیة في مكافحة دودة االلوز الافریقیة Helicoverpa ar

These studies were conducted in White Nile State on one of the important field pests of tomato, African bollworm Helicoverpa armigera Hubner. The studies included a field survey to determine the presence and distribution of African bollworm in the White Nile State and a laboratory studies to calculate morphmetrics measurement s of insect stages , to study some biological activities of the insect and to evaluate the efficacy of leaves and stem ethanol and aqueous extracts of Lantana camara (Verbenaceae), Ocimum basilcum (Lamiaceae), Lupinus termis (Leguminaceae), Solenostemma argel (Asclepiadaceae) and Nicotiana rustica (Solanaceae). The evaluated efficacy parameters included mortality, repellency and antifeeding effects on Helicoverpa armigera larvae. The study showed that the pest was present and distributed along the state in all studied area (Elsoufi, Eltawiella and Elmogamaat) with high rate of infestation in December. The results showed that at an average temperature range of ( 27± 1.10 C - 30 ± 2.9 0 C) and relative humidity of (35.2 ± 3% - 40.7± 2.8% ), the morphometrics and the development duration of insect stages were as follows: The morphometrics study of insect stages revealed that the egg size was (0.5±0.07 and 0.44±0.04 ) mm in length and width respectively; with yellowish white colour. The 1 st , 2 nd , 3 rd , 4th and 5th larval instars size were (1.42 ± 0±xii 0.1) , (4.2 ± 0.19 and 1.1± 0.2 ), (8.27 ± 0.7 and 2.3 ± 0.2 ), (10.1 ± 0.9 and 2.7 ± 0.2 ) and (17.1 ± 3.8 and 3.3 ± 0.2 ) mm in length and width respectively and they exhibited variations in colour. The pupa was 18.6 ± 1.4 and 4.9 ± 0.33 mm in length and width respectively; the colour started as green then turned brown. The adult male wing span and body length were 27.6 ± 2.1 and 16 ± 1 mm respectively , the female wing span and body length were 35.8 ± 2.3 and 19.2 ± 2.4 mm respectively, the colour ranged from grey to brown with markings on wings.