Effect of certain pesticides alternative against Sesamia cretica (led.) And Ostrinia nubilalis (hub). In maize fields. Beni- Suef Governorate.

Two experiments were conducted in maize fields in Beni Suef Governorate to evaluate some insecticides alternatives to control the pink stem borer, Sesamia cretica and European corn borer, Ostrinia nubilalis at an early planting date during April and late planting date at the end of May.
The results showed , The plant extract Tagetes oil was the most effective against the pink corn borer, followed by the algal metabolite C (the algal metabolites of Chlorella vulgaris)  as a compared with the stander biocide Spintor 24% . The average percentage reduction of perforated leaf plants and dead heart plants were (86.53 & 79.50), (61.95 & 54.23) and (89.56& 91.07 %) for early planting date and were (81.11 & 78.33), (46.67& 63.33) and (86.67 & 80.71 %) for late planting date, respectively.
Concerning on the efficiency of these treatments on the infestation of European corn borer, O. nubilalis. The plant extract Tagetes oil was the most effective followed by the algal metabolite C as a compared with the stander biocide Spintor 24%. The seasonal average percentage reduction of tunnel holes and diapouse larvae were (69.66 & 55.26), (49.48 & 34.82) compared with (76.34 & 67.76 %) for stander biocide Spintor 24% and were (73.47 & 53.90), (52.68 & 41.74) compared with (76.59 & 63.15 %) for stander biocide Spintor 24% at an early and late planting date, respectively.
The algal metabolite A (the algal metabolites of Apanocapsa pulchra) was the least effective against S. cretica and O. nubilalis followed by B (the algal metabolites of Aphanocapsa elachista) as a compared with the stander biocide Spintor 24%.
On the other hand, the effect of these treatments on the actual yield were studied. The plant extract Tagetes oil and the stander biocide Spintor 24% gave the highest grain yield of maize in the early and late plantations. The average actual yield were (19.28, 16.89) and (22.19, 17.74) ardab / feddan indicating an increase of (33.27, 39.27%) and (42.02, 42.18 %) than control for early and late planting date, respectively.