Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 2
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

Toxicity and physiological alterations were determined in Pseudococcus viburni nymphs treated with Artemisia annua methanolic extract. The leaf dipping bioassay showed LC50 values of 0.287% and 0.194% 24 and 48 hours post-exposure. Activities of general esterases were significantly higher in the control nymphs than in those which had been treated except for the 48 h time interval using α-naphtyl acetate. The activity of glutathione S-transferase using CDNB (1-chloro-2,4-dinitrobenzene) in the control nymphs, was significantly higher than in the control at both time intervals while no significant difference was observed after 24 h in addition to the higher enzymatic activity in the treated nymphs after 48 h. All three aminotransferases were significantly more active in the control nymphs except for time intervals of 24 h for γ-glutamyl transferase and 48 h for alanine aminotransferase. Higher activities of lactate dehydrogenase, acid- and alkaline phosphatase were found in the control nymphs than in treated nymphs for all time intervals. Activities of the enzymes involved in the antioxidant system including catalase, peroxidase, superoxide dismutase, ascorbate peroxidase and glucose-6-phosphate dehydrogenase was increased in the treated nymphs compared to the control. Results of the current study demonstrated toxic effects of A. annua methanolic extract on P. viburni nymphs causing mortality and physiological turbulences.

Go to article

Authors and Affiliations

Samar Ramzi
Ali Seraji
Reza Azadi Gonbad
Kimia Mirhaghparast
Zahra Mojib-Haghghadam
Download PDF Download RIS Download Bibtex

Abstract

The effects of two native isolates of Beauveria bassiana, AM-118 and BB3, were evaluated on the predatory coccinellid, Cryptolaemus montrouzieri by measuring several developmental parameters and intermediary metabolism. Treatment with both isolates significantly increased the length of each developmental stage compared to the control except for the eggs and adults. The preovipositional period in the adults treated with BB3 significantly increased compared to those treated with AM-118 and the control. Other parameters, including longevity, length of oviposition period and fecundity, showed no significant differences between treatments. Although there were no significant differences in the parameters of net reproduction rate ( R0) and gross reproduction rate ( GRR) between the control and fungal treated C. montrouzieri, the intrinsic rate of population increase ( r) and finite rate of population (λ) for the control treatments were significantly higher. The activities of both aminotransferases in the larvae and the adults treated with both isolates significantly increased 96 hours post-treatment compared to the control. Although similar results were recorded for acid phosphatase activity, alkaline phosphatase activity showed no significant differences in larvae and adults between the treatments. The amount of protein significantly decreased in the larvae and the adults treated with both isolates after 96 hours, while the amount of triglyceride significantly reduced in the treated larvae compared to control. No significant differences were observed in adults. Our results indicated that both native isolates of B. bassiana may affect life fitness of C. montrouzieri but isolate AM-118 was more compatible than BB3.
Go to article

Authors and Affiliations

Sara Aghaeepour
1
Arash Zibaee
1
Samar Ramzi
1 2
Hassan Hoda
3

  1. Department of Plant Protection, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran
  2. Tea Research Center, Horticulture Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Lahijan, Iran
  3. Department of Biological Control, Iranian Institute of Plant Protection Agricultural Research, Education and Extension Organization (AREEO), Amol, Iran

This page uses 'cookies'. Learn more