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 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.

scholarly journals LARVACIDAL EFFECT OF SOME PLANT EXTRACTS AGAINST TOMATO LEAF MINER (TUTA ABSOLUTA MEYRICK; LEPIDOPTERA: GELEHIIDAE)

2021 ◽  
Vol 9 (3) ◽  
pp. 101-107
Author(s):  
Pervin Erdogan ◽  
Zemran Mustafa
Keyword(s):  
Mortality Rate ◽  
Plant Extracts ◽  
Tomato Leaf ◽  
Tuta Absoluta ◽  
Leaf Miner ◽  
Tagetes Patula ◽  
Insecticidal Effect ◽  
Larvicidal Effect ◽  
Tomato Leaf Miner ◽  
Chemical Pesticides

Tuta absoluta Meyrick (Lepidoptera: Gelehiidae) is a significant tomato pest, and chemical pesticides are used extensively for its control. Because of the adverse effects of chemical pesticides, researchers have been paying attention more to biopesticides. In this study, the larvicidal effects of the extracts of Tanacetum vulgare (Asteracea), Aleo vera (L.) and (Liliaceae) Tagetes patula L. (Asteracea) was determined and trials were conducted by using leaf dipping and pot methods. The leaf dipping method was conducted in a climate chamber, whereas the potting experiment was performed in the greenhouse. In all of the experiments, second-stage larvae were used to determine the larvicidal effects. According to the results obtained, the highest larvicidal effect and mortality rate was observed at the highest concentration of T. vulgare extract (86%, effect: 86.55%). The lowest mortality rate and the larvicidal effect was observed at the same concentration of T. patula extract (mortality: 79%, effect: 78.55%). In the pot experiment, the highest yield was seen in the Neem Azal T/S, followed by T. vulgare, A. vera and T. patula extracts. On the first day counts, the lowest insecticidal effect was obtained with the lowest concentration of T. patula extract. The extract of A. vera, T. vulgare and T. patula was effective in experiments carried out in pot and laboratory conditions on T. absoluta. It is suggested that more research be done on using these extracts as a biopesticide to control T. absoluta. Keywords: Tomato leaf miner, plant extracts, larvacidal effect.

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
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