Abstract
The present study aimed to evaluate the insecticidal activity of hydroalcoholic plant extracts on Aphis craccivora Koch nymphs in cowpea. The experiments were carried out under greenhouse conditions in a randomized block design with five repetitions. Hydrated ethanol was used as a solvent in the botanical extract preparation. Cowpea plants were infested with five female adult aphids, eleven days after planting. After 48 hours, the adults were removed from the plants, leaving the recently bred nymphs. The evaluation of the nymphs’ survival was carried out forty-eight 48 hours after the application of the plant extracts. The botanical extracts with more than 50% efficiency were: Allium tuberosum leaf, Caesalpinia ferrea leaf, Piper aduncum leaf, Carica papaya seed, Dieffenbachia picta leaf, Cucurbita moschata seed and the control treatment, Annona squamosa seed. The botanical extracts with less than 50% efficiency were: Allium sativum bulb, Anacardium occidentale leaf, Borreria verticillata leaf plus flower, Coffea arabica leaf and seed, Delonix regia leaf and flower, Euphorbia tirucalli leaf, Leucaena leucocephala leaf, Mimosa caesalpiniaefolia leaf, Nerium oleander leaf, Syzygium cumini leaf, endocarp and pericarp, Syzygium malaccense leaf, Zingiber officinale rizome and Ziziphus joazeiro leaf. The highest efficiency levels were obtained by D. picta and C. moschata, rendering these extracts suitable for field trials to further evaluate their efficieny against the cowpea black aphid.
Highlights
The extracts that significantly differed from the absolute control were Allium sativum, Allium tuberosum, Anacardium ocidentale, Annona squamosa, Borreria verticillata, Caesalpinia ferrea, Carica papaya, Coffea Arabica, Cucurbita moschata, Dieffenbachia picta, Euphorbia tirucalli, Leucaena leucocephala, Nerium oleander, Piper aduncum, Syzygium cumini leaf and endocarp + pericarp, Syzygium malaccense, Ziginber officinale and Ziziphus joazeiro (Table 2)
Statistical differences were observed between the extracts of different structures of the S. cumini species, in which the leaf presented higher biocidal potential compared to the endocarp and pericarp
It would be interesting to verify the constituents of each plant part, to analyze its toxicity and, to evaluate its potential participation in commercial formulations of pesticides
Summary
Efficiency of botanical extracts against Aphis craccivora Koch (Hemiptera: Aphididae) nymphs in Vigna unguiculata (L.) Walp. Jefferson Auteliano Carvalho Dutra , Victor Emmanuel de Vasconcelos Gomes , Ervino Bleicher , Deivielison Ximenes Siqueira Macedo & Mirla Maria Mesquita Almeida. Article History: Received: 03.vi.2020 Accepted: 13.x.2020 Published: 21.xii.2020
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
