Weeds are very problematic for tomato production worldwide. Differences in formulations of the same herbicide have different effects on weeds and crops. There are no published studies on the effect of the capsule suspension of pendimethalin (Pend) products on tomato in Egypt. The present study aims at evaluating three pre-plant Pend products compared with a post-plant metribuzin (Met) and hand hoeing on their efficiency on weed control and on the growth, yield, yield attributes, stand loss rate of tomato plants, and their economic benefit implications in tomato production. During the fall-winter seasons of 2019/2020 and 2020/2021, six weed control treatments were studied including three pre-plant Pend products, a post-plant Met, hand hoeing, and un-weeded control in tomato field experiments. Weed density, fresh weight [FW], and FW reduction% were measured. Tomato measurements included stand loss rate, vegetative growth parameters, leaf chlorophyll concentration, fruit diameter and length, marketable and total yields, fruit total soluble solids, and pH. All herbicides and hand hoeing treatments significantly reduced weeds FW. Stand loss rates of tomato were 0% in hand hoeing followed by Sencor (~ 9.3–11.1%). Vegetative growth and leaf chlorophyll concentration were improved in all treated plots as compared to the control. The highest significant increases in tomato branch number, plant height, stem diameter, and shoot FW were observed in Sencor and Mostmicro treatments. The highest marketable and total fruit yields were observed with Sencor. Met had the highest benefit–cost ratio in the study. All herbicides were effective against various noxious weeds, but tomato “hybrid 65,010” was more tolerant to Met which resulted in better yields than those obtained with Pend products. The most cost-effective method of weed control was Met.

Keywords:Solanum lycopersicum; Herbicides; Hand hoeing; Plant stand loss; Vegetative growth; Marketable and total yield