EFFECT OF CERTAIN PLANT EXTRACTS AGAINST SESAMIA CRETICA LED. IN MAIZE FIELDS

Document Type : Original Article

Authors

1 Plant Protection Department, Faculty of Agriculture, Benha University, Egypt

2 Field Crop Pests Research Department, Plant Protection Research Institute, Agricultural Research Center, Giza, Egypt

Abstract

Jojoba oil preparations (Nat 1 and Natcom 40) and bestachia leaves extracts (in water, methanol and acetone) in addition to Diazinox were assayed for effectiveness against Sesamia cretica Led. in 2002 & 2003 early summer maize plantations. Data revealed that methanol-bestachia extract caused severe reduction in egg-mass counts (86.5% than control). Nat 1 caused the highest reduction in larval counts (81.4%). The highest reduction in number of plants containing perforated leaves and dead hearts (81.2 and 86.5% than control, respectively) were due to Nat 1 treatment. increasing the resultant dry ears yield (24.9 ardab / feddan), reflects 86.7% increase in corn yield than control. In addition, these materials manifested prolonged effects when caused a longer pupal period than control (9 days), 49% reduction in pupal weight Also, these materials had a delayed effect on deposited eggs 61 and 69.6% reductions, respectively, in hatching larvae were recorded than control. Data from the lab. were, almost, in the same trend as those from the field in which the shortest LTso values (4.24, 3.01 and 2.53 days) for the V; 341 and 5° instars larvae treated with Nat 1 at 1% concentration. Also, the lowest LCso values were occurred for the three respective instars in the treatments of acetone-bestachla extract (0.079 - 0.098%) and Nat 1 (0.087 - 0.121%). Jojoba oil (Nat I) and bestachia leaves extracts could be considered as successful natural agents as used in an integrated pest control program of S. creba9 in maize plantations.

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