Toxicity Effect of Three Insecticides on Important Pests and Predators in Tomato Plants
نویسندگان
چکیده
The objective of this study was to evaluate insecticide toxicity on Bemisia tabaci, Tetranychus evansi, Orius insidiosus, Cycloneda sanguinea and Chauliognathus flavipes in tomato plants. The following toxicity treatments were applied: T1: control, T2: chlorpyrifos (Pitcher) 450 EC (1.25 L.ha), T3: chlorpyrifos 450 EC (Pitcher) (0.62 L.ha), T4: thiamethoxam 100 WG (1.00 L.ha), T5: thiamethoxam 250 WG (0.50 L.ha), T6: teflubenzuron 150 CS (0.025 L.ha) and T7: teflubenzuron 150 CS (0.0125 L.ha). For the sub-lethal effect, a tenth of the recommended concentration was used. The insecticide teflubenzuron was effective against whitefly nymphs, while chlorpyrifos and thiamethoxam were efficient against adult whiteflies. Insecticides at the dose and lower dose were not efficient to control the adults and nymphs of mite T. evansi. Teflubenzuron was selective at the two doses tested against C. sanguinea and C. flavipes, while thiamethoxam was selective (lower dose) against these two predators. Chlorpyrifos was selective against C. flavipes (lower dose). All insecticides were selective or moderately selective at 21 days after application. Insecticides were not efficient to control the adults and nymphs of T. evansi. The growth regulating insecticide teflubenzuron was effective against whitefly nymphs. Chlorpyrifos and thiamethoxam were efficient against adult whiteflies. In general, the insecticides neonicotinoid and pyrethroid were selective to three predatory species and had lower sublethal impact compared with the organophosphate.
منابع مشابه
Insecticidal Effect of Clary Sage (Salvia sclarea) Essential oil Against Callosobruchus maculatus (Col: Bruchidae) and Tribolium confusum (Col: Tenebrionidae)
Background: Nowadays stored–product insect pests are controlled by pesticides and chemical fumigant compounds. The continueous use of chemical pesticides is harmful for non–target creatures specially humans and other mammals. Beside they polluted the environment. Objective: Accoring to the studies, the essential oil of Labiatae plants have insecticidal activity against some pests. In this st...
متن کاملمقایسه تأثیر سه حشرهکش و رهاسازی بال توری سبز [Chrysoperla carnea (Steph.)] علیه سفید بالک گلخانه (Trialeurodes vaporariorum West.)
Greenhouse whitefly, Trialeurodes vaporariorum West. is one of the most important pests of the field crops and ornamental plants in greenhouses. Pest control is based on using chemical insecticides and biological control agents. In this study, the efficiency of the green lacewing, Chrysoperla carnea ( Steph.) with release ratios of 1:1, 1:5, 1:10, 1:15, and 1:20 (predator:prey) using eggs in ch...
متن کاملمقایسه تأثیر سه حشرهکش و رهاسازی بال توری سبز [Chrysoperla carnea (Steph.)] علیه سفید بالک گلخانه (Trialeurodes vaporariorum West.)
Greenhouse whitefly, Trialeurodes vaporariorum West. is one of the most important pests of the field crops and ornamental plants in greenhouses. Pest control is based on using chemical insecticides and biological control agents. In this study, the efficiency of the green lacewing, Chrysoperla carnea ( Steph.) with release ratios of 1:1, 1:5, 1:10, 1:15, and 1:20 (predator:prey) using eggs in ch...
متن کاملکارایی تله های کارتی زرد رنگ چسبناک به منظور کنترل جمعیت مگس مینوز برگ (Liriomyza sativae Blanchard (Diptera: Agromyzidae در خیار گلخانه ای
Various species of serpentine leaf miner are serious pests of vegetable crops, especially on cucumber and tomato, in greenhouse and open fields. Reduction of chemical insecticides’ use in order to minimize pesticide residues on these crops is one of the most important aspects of food safety. Yellow sticky cards have been used successfully for many pests and can be used for leaf miners too. Ther...
متن کاملSusceptibility of immature stages of a biocontrol agent, Cheilomenes sexmaculata, to imidacloprid and pyriproxyfen
Chemical control is one of the important strategies in agricultural pest management because of easy operation, availability and fast control of pests. On the other hand, the environment has been exposed to various types of pesticides and pollutants which are growing daily. The persistent effects of residual pesticides commonly used cause numerous problems for non-target organisms especially par...
متن کامل