Toxicity of Shirazi thyme, Zataria multiflora essential oil to the tomato leaf miner, Tuta absoluta (Lepidoptera: Gelechiidae)

2018 ◽  
Vol 38 (04) ◽  
pp. 340-347 ◽  
Author(s):  
Samira Goudarzvande Chegini ◽  
Habib Abbasipour ◽  
Jaber Karimi ◽  
Alireza Askarianzadeh
Keyword(s):  
Probit Analysis ◽  
Tuta Absoluta ◽  
Leaf Miner ◽  
Gas Chromatography Mass Spectrometry ◽  
Agricultural Product ◽  
Fumigant Toxicity ◽  
Zataria Multiflora ◽  
Tomato Leaf Miner ◽  
High Volatility ◽  
Oil Concentration

AbstractThe tomato leafminer, Tuta absoluta (Meyrick) is a destructive pest of tomato, potato and other solanaceous crops of economic importance. One of the primary tools in its management is the use of conventional synthetic insecticides; however, this overreliance on synthetic insecticides quickly leads to the problem of insecticide resistance. In recent years, essential oils (EOs) of medicinal plants have received much attention as pest control chemical agents. If found, active compounds that are less persistent will be beneficial for both the environment and agricultural product consumers. In the current study, we studied the fumigant toxicity of EO of the Shirazi thyme, Zataria multiflora Boiss on the eggs, the second larval instars and adults. We analysed the composition of the EO by gas chromatography–mass spectrometry. The major component in the oil was thymol (33.52%). The EO showed strong adulticidal, larvicidal and ovicidal activity. Results show that by increasing the oil concentration, mortality will increase. By Probit analysis, the LC50 values for eggs, second larvae (inside leaf, outside leaf) and adults were 60.26, 4.44, 1.26 and 1.38 µl/L air, respectively. The EO of Z. multiflora may be suitable as a fumigant, because of its high volatility and safety.

scholarly journals Effects of some bioinsecticides on the tomato leaf miner, Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae)

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Alime Bayindir Erol ◽  
Oktay Erdoğan ◽  
İsmail Karaca
Keyword(s):  
Mortality Rate ◽  
Active Ingredient ◽  
Metarhizium Anisopliae ◽  
Mortality Rates ◽  
Tomato Leaf ◽  
Tuta Absoluta ◽  
Leaf Miner ◽  
Verticillium Lecanii ◽  
Main Body ◽  
Tomato Leaf Miner

Abstract Background In this study, commercial bioinsecticides including entomopathogenic fungi, Beauveria bassiana, Metarhizium anisopliae, and Verticillium lecanii, and Spinetoram active ingredient insecticide were evaluated against the tomato leaf miner, Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae) larvae. Main body The active ingredients were prepared at the recommended concentrations under laboratory conditions and applied to the 2nd instar larvae of T. absoluta by spraying with a hand sprayer. On the 1st, 3rd, 5th, and 7th days of the application, evaluations were made by counting survived individuals. The findings showed that the highest mortality rates were detected in the case of Spinetoram with 56, 60, 88, and 100% on all counting days of the experiments, respectively. The highest mortality rate among bioinsecticides was recorded for M. anisopliae, with 87% mortality on the 7th day of application. Short conclusion As a result, Spinetoram was found the most effective insecticide when applied to T. absoluta, followed by M. anisopliae.

scholarly journals Chemical constituents and insecticidal activity of the essential oil from fruits of foeniculum vulgare miller on larvae of khapra beetle (trogoderma granarium everts)

2013 ◽  
Vol 59 (4) ◽  
pp. 86-96 ◽  
Author(s):  
Iyad Ghanem ◽  
Adnan Audeh ◽  
Amer Abu Alnaser ◽  
Ghaleb Tayoub
Keyword(s):  
Gas Chromatography ◽  
Essential Oil ◽  
Chemical Constituents ◽  
Exposure Period ◽  
Probit Analysis ◽  
Gas Chromatography Mass Spectrometry ◽  
Fumigant Toxicity ◽  
Foeniculum Vulgare ◽  
Trogoderma Granarium ◽  
Foeniculum Vulgare Miller

Abstract The objective of current study was to determine the chemical constituents and fumigant toxicity of essential oil isolated by hydro-distillation from dry fruit of bitter fennel (Foeniculum vulgare Miller). The chemical composition of the essential oil was assessed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). Constituents of the oil were determined as α-pinene (1.6%) and limonene (3.3%), fenchone (27.3%), estragol (3.9%), and (E)-anethole (61.1%). The fumigant toxicity of the essential oil was tested on larvae of the stored product insect Trogoderma granarium Everts. The mortality of larvae was tested at different concentrations ranging from 31.2 to 531.2 μl/l air and at different exposure times (24 and 48 h). Probit analysis showed that LC50 and LC90 following a 48 h-exposure period for essential oil were 38.4 and 84.6 μl/l, respectively. These results showed that the essential oil from F. vulgare may be applicable to the management of populations of stored-product insects.

scholarly journals TOMATO LEAF MINER, TUTA ABSOLUTA (LEP., GELECHIIDAE), POPULATION FLUCTUATION AND SEASONAL ACTIVITY IN THE FIELD

2020 ◽  
Vol 6 (8) ◽  
pp. 88-98
Author(s):  
Shahriar Asgari ◽  
Yaghoub Fathipour
Keyword(s):  
Larval Density ◽  
Pheromone Trap ◽  
Tomato Leaf ◽  
Tuta Absoluta ◽  
Population Fluctuation ◽  
Leaf Miner ◽  
Seasonal Activity ◽  
Tomato Field ◽  
Tomato Leaf Miner ◽  
Tehran Province

Seasonal activity and population fluctuation of tomato leaf miner, Tuta absoluta (Meyrick), a dangerous pest of tomato fields in Tehran province, were determined in Varamin region, south of Tehran province in 2015-2016. Number of moths in pheromone trap and number of larvae per plant were counted weekly in a trail tomato field. The trap capture began on mid-April in warm dry spring of 2015 and on mid-May in cool wet spring of 2016. The first and highest moth peaks in trap occurred about one month earlier in 2015 than 2016. The larval density per plant at the highest peak reached 2.34 and 10.8 in 2015 and 2016, respectively. A temperature range of 25-30°C was desirable to the pest in which the interval of successive peaks decreased. In both years, the pest created three generations over a growing season, according to larval peaks, but 11 over a year, according to trap data, that the 11th generation overwintered. The temperature of 35°C and above limited larval activity and decreased the population. After the crop removed, the pest population declined due to host shortage, but it increased with the access of hosts in the second cultivation since mid-September until the cold season.

Identification and Molecular Characterisation of mariner-Like Elements in the Tomato Leaf Miner Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae)

2019 ◽  
Vol 27 (2) ◽  
pp. 300
Author(s):  
A. Bettaibi ◽  
N. Casse ◽  
D. Bouktila ◽  
J.D. Rouault ◽  
H. Makni ◽  
...  
Keyword(s):  
Tomato Leaf ◽  
Tuta Absoluta ◽  
Leaf Miner ◽  
Molecular Characterisation ◽  
Tomato Leaf Miner

Bioactivity of plant extracts against tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae)

2019 ◽  
Vol 21 (02) ◽  
pp. 146-150
Author(s):  
A. Ndereyimana ◽  
S. Nyalala ◽  
P. Murerwa ◽  
S. Gaidashova
Keyword(s):  
Plant Extracts ◽  
Tomato Leaf ◽  
Tuta Absoluta ◽  
Leaf Miner ◽  
Tomato Leaf Miner

scholarly journals Pathogenicity of some commercial formulations of entomopathogenic fungi on the tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae)

2019 ◽  
Vol 29 (1) ◽  
Author(s):  
Assinapol Ndereyimana ◽  
Samuel Nyalala ◽  
Patrick Murerwa ◽  
Svetlana Gaidashova
Keyword(s):  
Entomopathogenic Fungi ◽  
Larval Mortality ◽  
Mortality Rates ◽  
Negative Control ◽  
Tomato Leaf ◽  
Tuta Absoluta ◽  
Leaf Miner ◽  
Tomato Production ◽  
Tomato Field ◽  
Tomato Leaf Miner

AbstractThe tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae), is a major threat to tomato production in Rwanda. Laboratory bioassays were conducted to evaluate some commercial entomopathogenic fungi (EPF) formulations on T. absoluta larvae. The larvae, inside the leaf galleries, were obtained from the established tomato field. Commercial EPF: Metatech® WP [Metarhizium anisopliae (Metschn.) Sorok, Strain FCM Ar 23B3], Beauvitech® WP [Beauveria bassiana (Bals.) Vuill., Strain J25], and Botanigard ES [B. bassiana (Bals.), Strain GHA] were tested in Petri dishes against T. absoluta larvae at a concentration of 108 spores/ml. A synthetic insecticide, imidacloprid was included for comparison as a positive control, while water was used as a negative control. All the tested commercial EPF formulations were pathogenic to T. absoluta larvae in all conducted bioassays. Mortality rates increased with an increase in time (days). However, the insignificant difference was observed in the mortality of T. absoluta larvae treated with the commercial EPF during the first 3 days in all bioassays. Highly significant differences (p < 0.01) in pathogenicity among treatments were observed from the 4th to 6th days after inoculation. Metatech® WP and Beauvitech® WP recorded the highest mortality rates (82.8 and 60.8%) with the LT50 values of 3.9 and 5.2 days, respectively, while imidacloprid caused the least larval mortality. Since the EPF demonstrated high virulence level against the target pest, the efficacy of Metatech® WP and Beauvitech® WP should be advanced to field evaluation to determine their potential as alternatives to the synthetic insecticides.

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