Document Type : Full research articles
Authors
1
Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt
2
Plant Protection Department, Faculty of Agricultural, South Valley University, Qena, Egypt
Abstract
The current work was carried out in Shandweel Agricultural Research Station, Sohag Governorate in two successive summer seasons of 2021 and 2022 to study the population density of L. trifolii on four vegetable host plants in relation to some weather factors. Results indicated that L. trifolii formed 2, 1, 2 and 4 peaks in the 2021 season, and 2, 2, 2 and 4 peaks in 2022 season on common bean, cantaloupe, okra and cowpea, respectively. The highest activity period was observed during March for common bean and April for cantaloupe and okra plants, however, the highest rate of infestation was observed during July in case of cowpea. According to simple correlation (r) simple regression (b) and partial regression (p.reg.) values between some weather factors and population density of L. trifolii on the four studied crops, maximum and minimum temperature almost affected negatively on the pest population, while, relative humidity showed a positive correlation. The combined effect of the three factors on L. trifolii population was 60.80%, 33.42%, 3.88% and 29.75% in 2021 season, and 74.46%, 60.74%, 70.63% and 36.11% in 2022 season on common bean, cantaloupe, okra and cowpea, respectively. Concerning the host preference of L. trifolii, it is clear that common bean plants recorded the highest mean numbers of 9.53 and 8.56 mines/ 10 leaves in the two seasons, respectively, followed insignificantly by cantaloupe in the second season, however, okra recorded the lowest significant mean number of mines with 2.30 and 2.32 mines/ 10 leaves in the two seasons, respectively.
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