background: aedes aegypti mosquito is responsible for transmitting human diseases like dengue and chikungunya. personal or space protection with insect repellents is a practical approach to reducing human mosquito contact, thereby minimizing disease transmission. essential oils are natural volatile substances from plants used as protective measure against blood-sucking mosquitoes. methods: twen...

The objective of this study was to quantify the influence of zinc oxide nanoparticles (nanoZnO) on the water repellency and dimensional stability of beech wood. Beech wood blocks were treated with a nano-ZnO solution at four treatment levels (0, 10,000, 20,000, and 40,000 ppm) using a modified dip method. Also, a thermal treatment was performed at 60 and 120°C. After conditioning the samples, w...

background: medicinal plant extracts such as those obtained from salvia species have a wide variety of chemical compounds in their essential oils. the repellency of a number of essential oils including those from the labiates like salvia against several insect species including the common house flies is reported. objective: the aim of this investigation was to find out the excito-repellency eff...

background: malaria is the most important vector-borne disease in many tropical countries all over the world. because of the widespread use of pyrethroid insecticide treated mosquito nets in the world, the effects of excito-repellency (er) phenomenon of pyrethroids against main malaria vector, anopheles stephensi were studied. methods: the er phenomenon of three concentrations of two synthetic ...

in recent years a large number of pesticides used in the warehouses fumigation have been abandoned, and only methyl bromide and phostoxine are widely used for fumigation of foodstuffs and storage spaces. due to possibility of health impairment, environmental contamination and resistance enhancement of insects, the use of these two fumigants is under scrutiny and restriction. under such circumst...

Megalurothrips sjostedti Trybom is an important pest of cowpea (Vigna unguiculata L.) in Africa. To propose an alternative to chemical control, the repellency of 24 plant extracts was evaluated against adult female thrips of M. sjostedti in the laboratory. Plant extracts in ethanol were separately applied on a filter paper disk in a still air visual cue olfactometer. The results showed highly s...

Previously, we reported an interesting relationship between virulence and repellency of different isolates of the fungus Metarhizium anisopliae towards the termite Macrotermes michaelseni: the higher the virulence of a given isolate, the greater its repellency. In the present study, we compared the volatile profiles of two isolates, one that was more virulent (and repellent) and one that was le...

the occurrence of soil water repellency and its intensity were studied in three sites under pinus teada, petrocarya fraxinifolia and sombucus ebulus in talesh township, western part of guilan province. seventy nine undisturbed soil samples from 0–5 cm depth were collected for water repellency and water-soil contact angle to be determined in a dry season. soil water repellency was assessed using...

Seven commercial essential oils extracted from the plant species Boesenbergia rotunda (L.) Mansf., Citrus hystrix DC., Curcuma longa L., Litsea cubeba (Lour.) Pers., Piper nigrum L., Psidium guajava L. and Zingiber officinale Roscoe, and naphthalene as a control, were evaluated for repellent activity against the three cockroach species Periplaneta americana (L.), Blattella germanica (L.) and Ne...

In recent years, the common bed bug, Cimex lectularius L. (Hemiptera: Cimicidae), became a major public health concern in urban communities. Bed bugs are notoriously difÞcult to control, and their bites are not tolerated by most people. The public has an urgent need for materials and methods to reduce bed bug introduction and bites during work, travel, or sleep. A repellent product will help ac...