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Tomato in Eritrea is affected by nearly 30 diseases and insect pests among which blight, leaf curl virus, root-knot nematodes, powdery mildew, Tuta absoluta, Helicoverpa armigera, aphids, whitefly and red spider mites are the most important. In the field, experiments were conducted in Hamelmalo Agricultural College for two consecutive seasons (2015 and 2016) in a Randomized Complete Block Design with three replications. Treatments used were pesticides (mancozeb, dimethoate, deltamethrin) and aqueous Neem seed kernel extract and their combinations. Disease incidence (DI), Disease severity (DS) of blights and infestations of Tuta absoluta [Lepidoptera:Gelechiidae] were assessed at different phenological stages of the crop. Mancozeb alone was not so effective to reduce either DI or DS or damage of plants but it causes declining the number of larvae of T. absoluta at flowering stage. T11 showed the highest control of DI, DS and reduced the larval population of T. absoluta per plot and minimized the damage level. Among all the treatments, T11 and T9 were the most effective to reduce the damage of plants and minimizing the larvae of T. absoluta at fruiting stage. Neem extract had the least effect than all treatments. Mancozeb (T1) and combinations of Mancozeb + Dimethoate + NSE (T11) gave significantly higher marketable yield than other treatments. The overall Cost-Benefit Ratio (CBR) was similar for all treatments during the two crop seasons, but the average CBR was higher for T11 whereas it was least for T3.
Isaac Kojo Arah, Ernest Kodzo Kumah, Etornam Kosi Anku, Harrison Amaglo. An overview of post-harvest losses in tomato production in Africa: Causes and possible prevention strategies. Journal of Biology, Agriculture and Healthcare. 2015;5(16).
[Accessed Aug 13, 2017]
Jones JB. Tomato plant culture, in the field, greenhouse and home garden. CRC Press, Washington, D.C.; 1999.
Samuel Asgedom, Paul C. Struik, Ep Heuvelink, Woldeamlak Arai. Opportunities and constraints of tomato production in Eritrea. African Journal of Agricultural Research. 2011;6(4):956-967
[Accessed 18 February, 2011]
MoA. Report on the crop protection activities. In: Basic agricultural facts of Anseba Region, Keren; 2003.
[Accessed on 23 April, 2011]
Syed D, Awet T, Bereket T, Gezae A, Ruta M. Survey on economical important fungal diseases of tomato in Sub-Zoba Hamemalo of Eritrea. Review of Plant Studies. 2014;1(4):39-48.
Syed Danish Yaseen Naqvi, Adugna Haile, Sethumadhava Rao, Belay Teweldemedhin, Virendra Kumar Sharma. Occurrence and prevalence of diseases and insect pests on vegetable crops in Zoba Anseba, Eritrea. Journal of Eco-friendly Agriculture. 2016;12(1):29-40.
Syed Danish Yaseen Naqvi, Adugna Haile, Sethumadhava Rao, Belay Teweldemedhin, Virendrakumar Sharma, Aggrey Bernard Nyende. Evaluation of husbandry, insect pests, diseases and management practices of vegetables cultivated in Zoba Anseba, Eritrea. Journal of Eco-friendly Agriculture. 2016;12(1):47-50.
Abate TA, van Huis JKO. Annual Review of Entomology. 2000;45:631- 659.
Varma J, Dubey N. Prospectives of botanical and microbial products as pesticides of tomorrow. Curr. Sci. 1999;76: 172–178.
Jeyasankar A, Jesudasan RWA. Insecticidal properties of novel botanicals against a few lepidopteran pests. Pestology. 2005;29:42–44.
Schmutterer H. Properties and potential of natural pesticides from the neem tree, Azadirachta indica. Annu. Rev. Entomol. 1990;35:271–297.
Tomé HVV, Martins JC, Corrêa AS, Galdino TVS, Picanço MC, Guedes RNC. Azadirachtin avoidance by larvae and adult females of the tomato leafminer Tuta absoluta. Crop Protection. 2013;46:63- 69.
Mayee CD, Datar VV. Phytopathometery Tech. Bult. 1. Marathwada Agri. Uni. Parbhani India. 1986;90-91.
Joel González-Cabrera, Oscar Mollá, Helga Montón, Alberto Urbaneja. Efficacy of Bacillus thuringiensis (Berliner) in controlling the tomato borer, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). BioControl. 2011;56(1):71–80.
Agbenin ON, Marley PS. In vitro assay of some plant extracts against Fusarium oxysporum fsp. lycopersici causal agent of tomato wilt. Journal of Plant Protection Research. 2006;46(3):215-220.
Salazar ER, Araya JE. Detección de resistencia a insecticidas en la polilla del tomate. Simiente. 1997;67:8- 22.
Lietti Marcela MM, Eduardo Botto Raúl, Alzogaray A. Insecticide resistance in Argentine populations of Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) Neotrop. Entomol. 2005;34(1).
Siqueira HÁA, Guedes RNC, Picanço MC. Insecticide resistance in populations of Tuta absoluta (Lepidoptera: Gelechiidae). Agricultural and Forest Entomology. 2000;2:147–153.