Abstract
Twenty maize hybrids plus local were tested for their susceptibility to major pests of sorghum shootfly,
Atherigona soccata Rondani under field conditions at Sohag governorate during three planting dates
(20th April, 20th May and 5th July) sown during two tested years (2004 and 2005 seasons). The
investigation showed that when the sowing dates were considered irrespective of the different years or
the maize hybrids it was evident that during the first planting date (20th April), the maize hybrids
harboured the highest levels of infestation with sorghum shootfly, Atherigona soccata Rondani. The
second planting date (20th May) was the least affected while the third planting date (5th July) received
moderate levels of infestation. Results also showed that the average infestation of Atherigona soccata
during both seasons was a significantly negative correlation affected by the sowing dates and maize
hybrids. The yield of maize hybrids negatively correlated with percentage of infestation by Atherigona
soccata. The highest yield obtained from the maize hybrids was slightly infested by Atherigona soccata and
sown during the planting date of 20th May. Therefore, the second sowing date (20th May) may be
recommended as a proper cultivating date for maize hybrids as it brought about reduction not only in
infestation but was also a good method to reduce chemical control. Our results indicated that none of
the maize hybrids evaluated were found to be resistant to Atherigona soccata attack but maize hybrids
were significantly different in their susceptibility and less than of a local control to the infestation with
Atherigona soccata and divided into four groups, the first one was highly susceptible including Giza
Baladi; the second group was susceptible including ten maize hybrids namely, Hf 155, Bionear 3062,
Bionear 30k8, Nagah 18, Watania 4, HC 326, HC 327, Nafratity, Watania 1 and Bionear; the third
group was low resistance including six maize hybrids namely, Hf 122, Hf 123, Hf 129, Hc314, Hc 325
and Hc 352; while the fourth group included Hf 10, Hf 124, Hc 311and Hc 324 and moderately resisted
the Atherigona soccata infestation. These may serve as a good material for growing in the areas where the
pest is a problem.