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Sci Rep

Title:		Silica nanoparticles as pesticide against insects of different feeding types and their non-target attraction of predators
Author(s):		Thabet AF; Boraei HA; Galal OA; El-Samahy MFM; Mousa KM; Zhang YZ; Tuda M; Helmy EA; Wen J; Nozaki T;
Address:		"Economic Entomology Department, Faculty of Agriculture, Kafrelsheikh University, Kafr El-sheikh, Egypt. ahmadthabet513@gmail.com. Genetics Department, Faculty of Agriculture, Kafrelsheikh University, Kafr El-sheikh, Egypt. ahmadthabet513@gmail.com. Field Crop Pests Research Department, Plant Protection Research Institute, Agricultural Research Center, Sakha, Kafr El-sheikh, Egypt. ahmadthabet513@gmail.com. Laboratory of Insect Natural Enemies, Institute of Biological Control, Department of Bioresource Sciences, Faculty of Agriculture, Kyushu University, Fukuoka, 819-0395, Japan. ahmadthabet513@gmail.com. Economic Entomology Department, Faculty of Agriculture, Kafrelsheikh University, Kafr El-sheikh, Egypt. Genetics Department, Faculty of Agriculture, Kafrelsheikh University, Kafr El-sheikh, Egypt. Field Crop Pests Research Department, Plant Protection Research Institute, Agricultural Research Center, Sakha, Kafr El-sheikh, Egypt. Laboratory of Insect Natural Enemies, Institute of Biological Control, Department of Bioresource Sciences, Faculty of Agriculture, Kyushu University, Fukuoka, 819-0395, Japan. Laboratory of Insect Natural Enemies, Institute of Biological Control, Department of Bioresource Sciences, Faculty of Agriculture, Kyushu University, Fukuoka, 819-0395, Japan. tuda@grt.kyushu-u.ac.jp. Regional Centre for Mycology and Biotechnology (RCMB), Al-Azhar University, Cairo, Egypt. Entomological Laboratory, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan. The Kyushu University Museum, Fukuoka, Japan"
Journal Title:		Sci Rep
Year:		2021
Volume:		20210714
Issue:		1
Page Number:		14484 -
DOI:		10.1038/s41598-021-93518-9
ISSN/ISBN:		2045-2322 (Electronic) 2045-2322 (Linking)
Abstract:		"The agricultural use of silica (SiO(2)) nanoparticles (NPs) has the potential to control insect pests while the safety and tritrophic effects on plants and beneficial natural enemies remains unknown. Here, we evaluate the effects of silica NPs on insect pests with different feeding niches, natural enemies, and a plant. Silica NPs were applied at different concentrations (75-425 mg/L) on field-cultivated faba bean and soybean for two growing seasons. The faba bean pests, the cowpea aphid Aphis craccivora and the American serpentine leafminer Liriomyza trifolii, and the soybean pest, the cotton leafworm Spodoptera littoralis, were monitored along with their associated predators. Additional laboratory experiments were performed to test the effects of silica NPs on the growth of faba bean seedlings and to determine whether the rove beetle Paederus fuscipes is attracted to cotton leafworm-infested soybean treated with silica NPs. In the field experiments, silica NPs reduced the populations of all three insect pests and their associated predators, including rove beetles, as the concentration of silica NPs increased. In soybean fields, however, the total number of predators initially increased after applying the lowest concentration. An olfactometer-based choice test found that rove beetles were more likely to move towards an herbivore-infested plant treated with silica NPs than to a water-treated control, suggesting that silica NPs enhance the attraction of natural enemies via herbivore-induced plant volatiles. In the laboratory, while silica NPs inhibited the development of faba bean roots at 400 mg/L, they did not affect germination percentage, germination time, shoot length, or vigor index compared to the control"
Keywords:		"Animals Aphids/drug effects/physiology Coleoptera/drug effects/physiology Dose-Response Relationship, Drug Egypt Germination/drug effects Insecta/*drug effects/*physiology Insecticides/chemistry/*pharmacology *Nanoparticles/chemistry Population Density Pr;"
Notes:		"MedlineThabet, Ahmed F Boraei, Hessien A Galal, Ola A El-Samahy, Magdy F M Mousa, Kareem M Zhang, Yao Z Tuda, Midori Helmy, Eman A Wen, Jian Nozaki, Tsubasa eng Research Support, Non-U.S. Gov't England 2021/07/16 Sci Rep. 2021 Jul 14; 11(1):14484. doi: 10.1038/s41598-021-93518-9"