DIETARY SILVER NANOPARTICLES REDUCE FITNESS IN A BENEFICIAL, BUT NOT PEST, INSECT SPECIES

Insect species, especially those considered to be pests, can be exploited for human consumption. One of the most devastating pest insect species in central Mexico is the grasshopper Sphenarium purpurascens. Here we develop a sustainable exploitation strategy that produces a considerable biomass of S. purpurascens while minimising the damage they cause to agricultural fields by changing the chemical control methods to a mechanical method. In this model the biomass-per-stage of grasshoppers that can be extracted annually using the mechanical method was calculated and their potential abundance was estimated using Maxent. With a calculated population density of 10-55 individuals of S. purpurascens per m2 over approximately 1,050,000 ha of the agroecosystems in Mexico, the estimated biomass of this insect averaged 350,000 tons per year (generating a gross income of US$ 3.5×108 million). Unlike chemical control methods, mechanical control has no toxic effects on human populations or other species inside or outside of the agroecosystems. Promoting a change from chemical to mechanical control methods of pest species could greatly impact on the health of millions of people globally and on the environment, reducing carbon dioxide and methane emissions, land clearing and the use of pesticides while obtaining economic profit.

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Detected of Pest İnsect Species on Pomegranate Areas in Adıyaman and Siirt Provinces

Kahramanmaraş Sütçü İmam Üniversitesi Tarım ve Doğa Dergisi ◽

10.18016/ksutarimdoga.vi.873939 ◽

2021 ◽

Author(s):

Murat GÜLMEZ ◽

Asime Filiz ÇALIŞKAN KEÇE ◽

Mehmet KAPLAN ◽

Mehmet Rifat ULUSOY

Keyword(s):

Insect Species ◽

Pest Insect

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Pest Insect Species, Distribution and Densities in Olive Orchards in Mardin Province

Journal of the Institute of Science and Technology ◽

10.21597/jist.536724 ◽

2019 ◽

pp. 1901-1907

Author(s):

Mehmet KAPLAN

Keyword(s):

Species Distribution ◽

Insect Species ◽

Pest Insect

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INVENTARISASI HAMA PASCAPANEN JAGUNG DALAM PENYIMPANAN DI TINGKAT PETANI DAN PEDAGANG DI KUPANG

AGRICA ◽

10.37478/agr.v1i1.478 ◽

2020 ◽

Vol 1 (1) ◽

pp. 24-28

Author(s):

Yustina Maria Silvia Wonga Puu ◽

Samuel Pakan ◽

Lince Makkun

Keyword(s):

Water Level ◽

Insect Species ◽

Pest Insect ◽

Corn Sample ◽

Damage Level ◽

Corn Seed ◽

Seed Damage ◽

Level Data ◽

Percentage Weight ◽

Weight Decrease

This research was conducted at pest and plant disease laboratory, faculty of agriculture Nusa Cendana University in Kupang. Corn sample is taken from fanner in Amarasi, Kupang Timur, Kupang Barat and from the trader in Oesapa, Oesao, Penfui. This research intends to inventory pest after yields corn and to know the damage level of corn in farmer and trader. This research used a 32 kg corn sample for quotation methods. The observed variable is pest insect species, imago population, damage seed percentage, Weight decrease percentage, water level, temperature and moisturizer. Pest insect population and species observed on 1 kg corn. While seed damage and weight decrease per cent on 100 g corn seed and 5 g for water level. Data result tabulated and descriptively analyzed. The result of the research showed 1 pest insect species in the farmer corn storage is S.zeanmys and 2 species in trader corn storage is S.zeanmys and T confusum. Highest population S.zeamays founded in Penfui trader by 50,50/kg and lowest population 4,50/kg in farmer at Amarasi. T.confusum population only founded in trader not in farmer level. Highest population 2,17/kg in Penfui trader and lowest 0,17/kg in Oesapa trader. While highest seed damage percentage founded in Penfui trader by 11,13% and lowest 1,22% in farmer at Amarasi and highest weight decrease percentage founded in Oesapa trade by 0,77% and lowest 0,25% in farmer at Kupang Barat

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Synthesis, performance and growth mechanism of silver nanoparticle coated SERS fiber probe

Matériaux & Techniques ◽

10.1051/mattech/2018061 ◽

2019 ◽

Vol 107 (3) ◽

pp. 305

Author(s):

Mengmei Geng ◽

Yuting Long ◽

Tongqing Liu ◽

Zijuan Du ◽

Hong Li ◽

...

Keyword(s):

Silver Nanoparticles ◽

Absorption Spectrum ◽

Reaction Time ◽

Growth Mechanism ◽

Fiber Optic ◽

Fiber Optic Probe ◽

Visible Absorption ◽

Fiber Probe ◽

Surface Enhanced Raman ◽

Optic Probe

Surface-enhanced Raman Scattering (SERS) fiber probe provides abundant interaction area between light and materials, permits detection within limited space and is especially useful for remote or in situ detection. A silver decorated SERS fiber optic probe was prepared by hydrothermal method. This method manages to accomplish the growth of silver nanoparticles and its adherence on fiber optic tip within one step, simplifying the synthetic procedure. The effects of reaction time on phase composition, surface plasmon resonance property and morphology were investigated by X-ray diffraction analysis (XRD), ultraviolet-visible absorption spectrum (UV-VIS absorption spectrum) and scanning electron microscope (SEM). The results showed that when reaction time is prolonged from 4–8 hours at 180 °C, crystals size and size distribution of silver nanoparticles increase. Furthermore, the morphology, crystal size and distribution density of silver nanoparticles evolve along with reaction time. A growth mechanism based on two factors, equilibrium between nucleation and growth, and the existence of PVP, is hypothesized. The SERS fiber probe can detect rhodamin 6G (R6G) at the concentration of 10−6 M. This SERS fiber probe exhibits promising potential in organic dye and pesticide residue detection.

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