Controlling Tuta absoluta (Meyrick) by Selected Crude Plant Extracts in the Laboratory and in the Screen House

Abstract

Effects of Commiphora swynnertonii, Synadenium glaucescens and Allium sativum extracts on the tomato leaf miner, Tuta absoluta (Meyrick) were evaluated on the adults and in screen house conditions. The adult stage was involved with 30 adults that were reared in an insectarium, the experimental design was a completely randomized design (plant extracts from three plants species  three doses of 2%, 4% and 8%). In the screen house, experimental dispositive was a completely randomized block design (two varieties of tomatoes  three plants extracts). Larval counts were performed after 0, 1, 2, 3 and 7 d of treatment, 40 tomato leaves (10  4 replicates) were randomly taken from each treatment. The mean percentage mortality of adults was recorded daily for 5 d.Results indicated that, each plant extract caused significant mortality to adults of T. absoluta after 5 d in comparison to the control. Leaf dipping against adult of T. absoluta proved to be the most effective for all plant extracts at 30%-100%. Commiphora resulted in the adults' mortality of 100%. In the screen house Commiphora showed the high reduction of infestation for Tanya and Cal J varieties. Treatment with this plant extract resulted in the highest fruit yield and the lowest yield loss compared to all the plant extracts. C. swynnertonii extract is recommended into integrated pest management strategies for the control of T. absoluta.

Oviposition deterrence and repellent activities of selected essential oils against Tuta absoluta Meyrick (Lepidoptera: Gelechiidae): laboratory and greenhouse investigations

“…Given the efficacy of some botanicals against T. absoluta, it is possible to use them in combination with soft pesticides in order to develop effective integrated pest management approaches that target this pest (Tarusikirwa et al 2020). Currently, many studies report ovicidal, larvicidal and adulticidal activities of EOs against this pinworm (Magalhães et al 2001;Umpiérrez et al 2012;Alam et al 2019;Esther et al 2019;Lo Pinto et al 2019Tarusikirwa et al 2020;Mansour and Biondi 2021); however oviposition deterrence and repellence effects are less investigated (Aynalem 2018;Marsin et al 2020). In this perspective, the aim of the present study was to assess the effectiveness of EOs from selected plants that are understudies in terms of oviposition deterrence and repellency activity against T. absoluta.…”

Pre-sowing treatments to improve seed germination and seedling growth of Commiphora swynnertonii (Burrt.) and Synadenium glaucescens (Pax.)

“…Among MPPs that are being rapidly pushed to extinction are Commiphora swynnertonii (Burrt) and Synadenium glaucescens (Pax). These plant species have medicinal and pesticidal attributes making them useful as medicine for humans and livestock as well as a pesticide for crop protection (Credo et al, 2022;Mary et al, 2022;Matendo et al, 2019;Nyigo et al, 2015a). Currently, the exploitation and indiscriminate collection of such MPPs is at its peak globally as the world is shifting to eating safe organically produced food (Chi et al, 2017;Moyo et al, 2015;van Wyk and Prinsloo, 2018).…”