The purpose of this study is to offer fundamental information for assessing the negative effects of the whitefly Bemisia tabaci on pepper plant traits (growth parameters, yield, and nutrients). During the 2023–2024 and 2024–2025 seasons, sweet pepper (Top Star F1 hybrid) field trials were carried out in a greenhouse in Mansoura, Dakhlia Governorate, Egypt. According to the data, B. tabaci infestations on sweet pepper plants in both sprayed and unsprayed main plots started four weeks after planting, in the first week of October, and lasted until the fourth week of January in each season.

According to the data, the sprayed pepper plants outperformed B. tabaci in terms of vegetative development parameters, such as average plant height, stem diameter, number of leaves/plants, and number of branches per plant. In comparison to plants sprayed with pesticides (treated with insecticides), the unsprayed plant leaves (free of pesticide treatments, control treatment) had lower plant fresh weight and lower percentages of moisture, nitrogen, phosphate, and protein. In this case, the sprayed plants had lower dry weight per plant, dry matter percentages, and K and Ca levels than the untreated plants.

As for the resulting pepper yield {number of fruits per plant, average fresh fruit weight (g), early yield/m² (kg), and total fruit yield/m² (kg)}, the treated plants outperformed the untreated plants. Untreated pepper plants infested with B. tabaci showed the highest reductions in all growth, nutrient, and productivity traits studied, with the exception of plant dry weight, dry matter percentages, and potassium and calcium contents.

Simple correlation estimates showed a highly significant negative relationship between variations in a specific preferred attribute and changes in B. tabaci counts and percentages of damaged leaves in all evaluated parameters, with the exception of fresh plant weight, moisture, nitrogen, and phosphorus percentages (all of which showed positive relationships).