الفهرس 
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Abstract
Field experiments were carried out during 2017 and 2018 seasons at El-Berka village, Abou Hommos city, Behaira province, Egypt to control T. absoluta on tomato variety namely; Malika F1 and potato variety namely spunta. The aim of this study was:
1. Study population fluctuations of T. absoluta on tomato and potato under open field conditions for two years (2017 and 2018) with sex pheromone to monitor and capture of T. absoluta males. Also, the climatic factors (temperature and relative humidity) on the population density and infestation percent of T. absoluta were studied.
2. Study the effect and efficiency of some chemical and bio pesticides to control T. absoluta by using four sequences as a model as follow:
Sequence (1): Flubendiamide → Chlorfenapyr →Emamectin benzoate →
Chlorantraniliprole
Sequence (2): Chlorfenapyr → Flubendiamide → Chlorantraniliprole →
Emamectin benzoate
Sequence (3): Chlorantraniliprole →Emamectin benzoate → Chlorfenapyr →
Flubendiamide
Sequence (4): Emamectin benzoate → Chlorantraniliprole→ Flubendiamide →
Chlorfenapyr
3. Calculate the generation number of T. absoluta per year under normal conditions.
4. Study the effect of tomato planting date on infestation with T. absoluta and also study the infestation level on different plant parts (Leaves, flowers and fruits).