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Mahmmod M.M. Soliman

Bio: Mahmmod M.M. Soliman is an academic researcher. The author has contributed to research in topics: Horticulture & Pepper. The author has an hindex of 1, co-authored 1 publications receiving 9 citations.
Topics: Horticulture, Pepper, Lufenuron, Cyfluthrin, Leaf spot

Papers
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Journal Article
TL;DR: All tested insecticides proved effective against T. absoluta and might be used to control this pest.
Abstract: Recently tomato leaf miner, Tuta absoluta, has become one of the most devastating pests of tomato in Egypt, and caused serious damages to tomato production in invaded areas. For this reason, the present study was undertaken to determine the efficacy of 15 insecticides representing different pesticide groups against this insect and also to study their dissipation in tomato fruits. The laboratory experimental results revealed that profenofos, cyfluthrin, lufenuron, chlorpyriphos-methyl and indoxacarb were the most toxic insecticides as compared to other chemicals. These insecticides, 1 day after application, under field conditions caused 84.1 to 73.5% reduction in infestation. With time the bio-residual activity of these compounds gradually decreased with increase in the number of infested fruits. The initial deposits of profenofos, cyfluthrin, lufenuron and chlorpyriphos-methyl ranged from 28.6 to 6.3 ppm, depending on the rate of insecticide application. The loss rate of these amounted to 91.7 to 97.57%, 15 days after treatment. In conclusion, all tested insecticides proved effective against T. absoluta and might be used to control this pest. Further, the bioresidual activity of these compounds did not exceed more than two weeks for the best cases.

10 citations

Journal ArticleDOI
TL;DR: In this paper , the nucleotide sequence of the tested isolate was deposited in NCBI GenBank with accession number MZ540733 and verified the identity of the pathogenic isolate was performed by BSXeF/BSXeR as specific primers for X. euvesicatoria which was showed amplification of a 173bp fragment.
Abstract: Necrotic spots on pepper fruits consider a typical symptom of bacterial spots disease.Xanthomonas euvesicatoria is the causative agent for this bacterial disease on pepper. Colonies isolated from symptomatic pepper fruits were exhibited typical growth on nutrient agar(NA), yeast dextrose calcium carbonate(YDC) and mTMB media. Colonies were convex, mucoid, glistening, wet and circular with an entire edge with yellow pigment.The bacterial isolates were matched with Xanthomonas bacteria in microscopical and biochemical tests. The isolates showed weakness in the hydrolysis of starch and negative in degrade pectate. Leaves of pepper plants exhibited water-soaked as a first reaction in the pathogenicity test. The spots turned to dark necrotic lesions and may fall and the leaves became perforated. On the stem, necrotic lesions were appeared then turned to dark color also the spots on surface fruits turned to dark color. Confirmation of the identity of the pathogenic isolate was performed by BSXeF/BSXeR as specific primers for X. euvesicatoria which was showed amplification of a 173bp fragment. BLAST in the NCBI GenBank database with the sequence of 16S rDNA indicated that the nucleotide sequence of a bacterial isolate obtained from the bacterial spot of pepper fruits in Egypt was 96.49% homologs to X. euvesicatoria. The nucleotide sequence of the tested isolate was deposited in NCBI GenBank with accession number MZ540733. X. euvesicatoria survived in pepper plant debris for one month to nine months while cannot survive in seed for the same time. X. euvesicatoria induced the symptoms on tomato, ground cherry, and London rocket plants.

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Journal ArticleDOI
TL;DR: The results showed that the impact of T. absoluta can be greatly reduced by the use of sustainable control measures represented by different insecticide groups, and encouraged farmers to use microbial and natural control measures in combating the tomato leafminer.
Abstract: Solanaceous plants have a great economic impact in Egypt. These groups of plants include potatoes, tomatoes and eggplants. The new invasive pest of tomatoes, Tuta absoluta (Meyrick) causes the greatest crop losses which can range from 60 to 100%. After its detection in Egypt during the last half of 2009, it spread quickly to all provinces in the country. We aiming to propose a sustainable control program for this devastating pest. In this research we tested three groups of control agents. The first was microbial and natural, the second – plant extracts and the third – chemical insecticides. Our results showed that the impact of T. absoluta can be greatly reduced by the use of sustainable control measures represented by different insecticide groups. Bioassay experiments showed that this devastating pest can be controlled with some compounds that give high mortality rates. Of these compounds, spinosad and Beauveria bassiana, microbial control agents, followed by azadirachtin, gave the best results in controlling T. absoluta. Of the chemical insecticides, lambda-cyhalotrin was the most effective, followed by lufenuron and profenofos. In conclusion we encourage farmers to use microbial and natural control measures in combating the tomato leafminer, T. absoluta, in Integrated Pest Mangement (IPM) programs.

20 citations

Journal Article
TL;DR: These insecticides were found effective in reducing T. absoluta infestation in both the seasons and Spinosad proved most promising and caused 98.6% reduction in T.AbsolutaInfestation in Egypt.
Abstract: Tuta absoluta has recently become one of the most devastating pests of tomato in Egypt. In this study, field experiments were conducted during two summer seasons (2012 and 2013) to determine the effectiveness of four insecticides, abamectin 152.4 g L−1 + thiamethoxam 33.2 g L−1 (Agriflex 18.6% SC), chlorpyrifos (Lirifos 48% EC), spinosad (Tracer 24% SC) and imidacloprid (Admire 20% SC), in controlling T. absoluta in tomato. These insecticides were found effective in reducing T. absoluta infestation in both the seasons. Spinosad proved most promising and caused 98.6% reduction in T. absoluta infestation in comparison of 62.8 and 54.8% by abamectin + thiamethoxam and chlorpyrifos, respectively. Imidacloprid was least effective with infestation reductions of 9.3%.

7 citations

Dissertation
01 Nov 2017
TL;DR: The study lays down some groundwork for exploiting semiochemical traits of the tomato species in novel management of T. absoluta, a pest that has spread to all parts of the world where tomato is grown.
Abstract: Tomato is rated the second most important horticultural crop after potato in most parts of the world. However, its cultivation is threatened by infestations of Tuta absoluta (Lepidoptera: Gelechiidae). The pest originated from South America and is now invading fields and greenhouse production sites in the world. Tuta absoluta was first officially reported in Kenya in March 2014 at Isiolo and has spread to all parts where tomato is grown. The pest has been nicknamed tomato ̳Al–shabaab‘ as it leaves unimaginable damage of the crop after infestations. Chemical methods used to control the pest have led to high levels of residues, hence risking consumers, harming the ecology and the environment. The present study was based on field observations that a wild tomato, Lycopersicon esculentum var. cerasiforme, which grows in the tea zones of Mount Kenya region, Kenya, is not attacked by T. absoluta, unlike the cultivated commercial tomato varieties. It was hypothesized that the wild variety may be actively avoided by gravid females because of the presence of constituents that deter gravid T. absoluta females. The objective of the present study was to compare the behavioral responses of T. absoluta to wild and cultivated tomato plants and characterize their mediating semiochemical blends. The responses of gravid T. absoluta females to the wild tomato and cultivated tomato, Solanum lycopersicum L. (Rambo F1 variety) intact plants in a dual–choice olfactometer was conducted where the gravid females were attracted to the cultivated species but repelled by the wild species, PI = -45.45%, X 2 = 10.47, df = 1, p < 0.05. The levels of infestation of the pest in mono–crop and intercrops of the two varieties were also compared. There was significant reduction in the levels of infestation in the intercrop arrangements (P<0.001, at α=0.05). Gas chromatography– linked mass spectrometry (GC–MS) of the headspace volatiles collected from the two tomato species revealed large differences in their chemical profiles. A total of 162 compounds were positively identified and quantified: 85 from cultivated tomato‘s day volatiles, 73 from wild tomato‘s day volatiles, 68 from cultivated tomato‘s night volatiles and 64 from wild tomato‘s night volatiles. Principle component analysis (PCA) resolved the compounds into 12 distinct principle component (PC) clusters. Of these clusters, PC1 and PC2 captured over 79.0% of the total variation. MANOVA and ANOVA tests on PC1 and PC2 revealed that there were significant differences in the volatile compositions, P < 0.00001, α = 0.05. Gas chromatography– linked electroantennography (GC–EAD) showed a large proportion of electroantennography (EAG)–active compounds from the two species of tomato plants. Of these, hexanal, trans-3hexenol, verbenene, 4-keto-isophorone, camphor, citronellal, isopulegol, limonene oxide, linalool propanoate, germacrene A, β-elemene, germacrene B, germacrene D, and β-bisabolene were unique to the wild tomato. A blend of available compounds, at the time of study, (trans–3– hexenol, camphor, citronellal and limonene oxide) showed dose-dependent repellence to gravid T. absoluta females in the dual–choice olfactometer. The study lays down some groundwork for exploiting semiochemical traits of the tomato species in novel management of T. absoluta.

6 citations

Journal ArticleDOI
30 Jun 2018
TL;DR: It is better to use chlorpyriphos alone in IPM program to reduce the costs and slow down the development of resistance of this insect-pest to other involved compounds in the mixtures.
Abstract: Field trials were carried at El-Ashartalaf feddan region, Behaira government, Egypt during two successive seasons of 2016 and 20117 to evaluate four insecticides and three of their mixtures against the tomato leafminer Tuta absoluta under field conditions. The seven evaluated insecticidal treatments were applied in three consequent sprays within an interval of 10 days between each in addition to the treatment of untreated check. The lonely or individually evaluated insecticides included chlorantraniliprole, thiamethoxam, lufenuron and chlorpyriphos which have been sprayed according to the recommendations of the Egyptian Ministry of Agriculture. Meanwhile, their evaluated mixtures: chlorantraniliprole + thiamethoxam, chlorantraniliprole+ lufenuron and thiamethoxam + lufenuronwere were applied at the rate of half recommended dose of each insecticide within the tested mixture. The obtained results showed a more or less toxic efficiency of the individually and/or admixed insecticides against the insect throughout both the seasons of 2016 and 2017. In the first season of 2016, the mixture of chlorantraniliprole + lufenuron was comparatively high effective during the elapsed period after the 1 and 2 spray; furthermore it was proved to be the utmost superior efficient post the 3 spray achieving complete infestation reduction (100%) of larvae. During the second season of 2017, chlorpyriphos was the most effective tested individual insecticide. The mixture of chlorantraniliprole + lufenuron was proved again to be superior achieving reduction level of 100% after the 3 spray. Therefore, this mixture would be recommended for achieving efficient control of T. absoluta in the growing tomato plants under field conditions. It is also better to use chlorpyriphos alone in IPM program to reduce the costs and slow down the development of resistance of this insect-pest to other involved compounds in the mixtures.

5 citations

Journal Article
TL;DR: The results of two experiments show that spinosad, B. t and azadirachtin had less insecticidal efficacy compared with thiocyclam on tomato leaf miner.
Abstract: Tuta absoluta (Meyrick) is a devastating pest of tomato. This pest is becoming resistant to many of the pesticides that used in the tomato fields. In this research, the efficacy of four bio-insecticides namely, thiocyclam, spinosad, Bacillus thuringiensis and azadirachtin ( Azadirachta indica ) were studied on the tomato leaf miner in the laboratory and field conditions. Laboratory experiments were performed in a randomized complete plot design with three replications against 1 st , 2 nd and 3 rd larvae. Field experiment was carried out on three larval stages based on recommended doses of pesticides in the form of a completely randomized block. The results showed that in laboratory conditions, LC 50 values and lower and upper bond with 95% confidence limits of thiocyclam, spinosad, B. t­ and azadirachtin on third instar larvae after 72 h, were 902.01(680.3- 1442.54), 1793.41 (1326.08- 2924.97), 2239.81 (2137.98- 2513.94) and 2572.09 (2423.62- 2736.74), respectively. In field experiments, thiocyclam and spiosad had the highest efficiency on mortality of the larvae with an average loss of 95.35 and 80.59%. B. t and azadirachtin with an average mortality of 67.29 and 66.40% had the lowest effect, respectively. The results showed that the third instar larvae were less sensitive than the first and second instar larvae for all pesticides. The results of two experiments show that spinosad, B. t and azadirachtin had less insecticidal efficacy compared with thiocyclam on tomato leaf miner. Recent study recommended using thiocyclam in integrated management of this pest.

5 citations