Evaluation of Sesamia sp. infestation in corn plants three years after insecticides elimination in Khuzestan province
1995
Azimi, A.R. | Beimani, M. | Fathizadeh, A.H.
Corn stem borer Sesamia sp. is one of the major pests of the corn fields at Khuzestan province. Although, it has a very potential egg parasitoid wasp, Platy elenomus hylas Nixon, which is naturally controlling the pest, it has been treated with chemical insecticides at a wide range. An investigation has been carried out with sampling over 34250 corn plants to determine the infestation level of the corn- plants by Sesamia sp. in 1994. The results revealed that the average infestation of plants by stem borrer larvae is 1.24. However, it is confirmed that the rate of infestation (1.24) as compared with previous years (10-14) has declined, and its parasitoid is totally able to control the pest. Moreover, it is concluded that avoidance of early extensive insecticide application against Spodoptera exigua Hb. and elimination of insecticides against pest itself is the only approach to maintain the natural control situation of the Sesamia sp. in cornfields of Khuzestan province
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