الفهرس 
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Abstract
Plant defensive systems against herbivores such as leafminers and piercing-sucking insect pests can be induced by application of biotic and abiotic elicitors. In this study, we focused on induction of plant defense to induce resistance against some important economic insect pests as a new approache for controlling some pests to the tested plant, tomato (Solanum lycopersicum) cv. GoldStone Hybrid F1. The presented study includes the following objectives:
The first, is a survey of Tuta absoluta in tomato nursery and field.
The second, investigates the effects of some elicitors on controlling Tuta absoluta and other major pests as well as effects on yield and some characteristics of tomato fruits.
The third, is studying the effect of the elicitor treatments on some enzymes activities, total phenolic compounds and total flavonoids of tomato plants.
The fourth investigates the effect of two local medicinal plant extracts and essential oils on Tuta absoluta population, plant growth and yield of tomato cv. Gold Stone.
The fifth objective explores the effect of these two local medicinal plant extracts and the essential oils on total phenolic compounds and total flavonoids of tomato plants.