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Previous reports showed that the root extracts of Stellera Chamaejasme L had acaricidal activity against Tetranychus vienneusis Zacher. However, the acaricidal mechanism of the root extracts from Stellera Chamaejasme L against Tetranychus vienneusisis not clear. Here, the effects of the root extracts from Stellera Chamaejasme L. on the activities of three enzymes of mites: protease, glutathiona s-transferase...
There were few reports mentioned changes of protective enzyme activities of Tetranychus viennensis after exposed to pesticides by now. Our previous study had showed that the chloroform extracts of Kochia scoparia had effective acaricidal activity against T. viennensis. Here, the toxicosis symptoms of T. viennensis were detaiedly studied after exposed to the chloroform extracts of K. scoparia KFCE-2...
The acaricidal activities of root extracts from the of Tateges erecta against T. viennensis were determined under illumination and non-illumination conditions. Furthermore, the effects of chloroform extract on several enzymes activities of T. viennensis were also evaluated. According to the F-test statistical analysis, the chloroform extract had acaricidal activities against T. viennensis under non-illumination...
Various extracts of Wikstroemia chamaedaphne were evaluated their acaricidal activities against Tetranychus cinnabarinus (Boisduval) and Tetranychus urticae Koch (Acari: Tetranychidae) in laboratory. According to our study, the Wikstroemia chamaedaphne extracts had significant acaricidal activities against T. cinnabarinus and T. urticae. In this study, the mean LC50 value for T. cinnabarinus and T...
Few studies mentioned acaricidal activity of Wikstroemia chamedaphne against Tetranychus viennensis. Here, we reported that W. chamedaphne had strongly acaricidal activity against T. viennensis. A method for purification of miticidal components from W. chamedaphne was developed as follows: Step 1, methanol immersion at room temperature; Step 2, liquid-liquid partition using petroleum ether; Step 3,...
Few studies reported the antifeedant activity of Stellera chamejasme extracts against larvae of Plutella xylostella. Here, laboratory choice and no-choice test feeding studies were conducted to assess the antifeedant activity of methanol extracts of S. chamejasme against larvae of P. xylostella. S. chamejasme Extracts caused severe feeding deterrence by 2nd or 3rd instars larvae of P. xylostella in...
The root of Stellera Chamaejasmel L. was extracted with three different polarity organic solvents methanol, chloroform and petroleum ether respectively, and the acaricidal activities of the root extracts against the Tetranychus cinnabarinus were tested. The results showed that the crude petroleum ether extract of the root of S. Chamaejasmel had the strongest acaricidal activity against T. cinnabarinus...
The communities and diversity of the beneficial insects on jujube trees were studied in jujube sites intercropped with pasture in Taigu, Shanxi province of China. The results showed that 8 orders, 25 families, 64 species and 5112.33plusmn30.65 individuals of insect natural enemies were found in the jujube sites intercropped with pasture site, while the corresponding numbers were 8, 35, and 3126.33plusmn23...
Most plants could produce bioactive substances including alkaloids, flavonoids, terpenes and relative materials, which are poisonous or have antifeedant effect to herbivorous animals, including some insects. Some well-known pesticides originated from plant bioactive substances have been successfully identified and used, for example, the azadirachtin from neem, nicotine from tobacco, rotenone and deguelin...
Few studies were mentioned to illustrate the role of plant hormones-IAA and ethylene in split-pit formation. Here, a random sample of 100 developing fruits from 7-year-old early maturing nectarines (Prunus persica L. Batsch cv. Ruiguang 5) was used as test material. The shape index and growth index of the sampled nectarines was comparatively analyzed to show the relation between fruit un-uniform growth...
Our previous studies showed that methyl palmitate had the acaricidal activity to T. viennensis. However, the mechanism of action of methyl palmitate on T.viennensis is unknown. Here, the toxicosis symptoms of T.viennensis exposed to methyl palmitate were studied to preliminarily uncover the acaricidal mechanism of methyl palmitate. Methyl palmitate caused dose-dependent mortality of T.viennensis...
Methyl palmitate, a kind of fatty acid methyl ester, has been found in many plants. Many biological functions of methyl palmitate have been found. Recently we isolated the methyl palmitate from the green walnuts husks and found it has acaricidal activity that had not been reported before. Here, the acaricidal activity of methyl palmitate, industrial methyl palmitate and the mixtures of methyl palmitate...
Methyl palmitate has showed acaricidal activity to Tetranychus cinnabarinus in our previous studies. However, the acaricidal mechanism of methyl palmitate to T. cinnabarinus is unknown. It was presumed that methyl palmitate may play its acaricidal activity to T. cinnabarinus by interfering the biological function of muscarinic receptors. In our studies, the most important muscarinic receptor subtypes...
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