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EVALUATION OF FIPRONIL FOR GRASSHOPPER MANAGEMENT IN THE PASTORAL AREA OF QINGHAI PROVINCE *
Author(s) -
Liu Zhibin,
Xu Shenquan,
Wang Haichuan,
Wang Qingchuan,
Zheng Zhemin,
Li Tao,
Liu Xiaojian,
Launois Michel
Publication year - 1999
Publication title -
insect science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 45
eISSN - 1744-7917
pISSN - 1672-9609
DOI - 10.1111/j.1744-7917.1999.tb00134.x
Subject(s) - fipronil , biology , grasshopper , nymph , significant difference , zoology , toxicology , dose , agronomy , ecology , pesticide , pharmacology , medicine
Cage and field experiments with Fipronil were carried out in Guomaying (Hainan Tibetan Autonomous Prefecture, Qinghai Province) to determine the mode of action, persistence, and the lowest dosage required of this new insecticide in the management of pasture grasshoppers. Three dominant species Angaracris rhodopa, Myrmeleotettix palpalis and Chorthippus dubius were chosen as the experimental materials. The results showed that Fipronil was a powerful contact and stomach poison against different grasshoppers at very low dosages of 4 and 8 g a. i/ha. In the cages, the difference between the effects of 4 and 8 g a. i. /ha of Fipronil on grasshoppers was usually negligible. The knocking down effects of contact were obviously quicker than that of stomach effect; no such difference was, however, found in the tests with the adults of M. palpalis. The persistent effect of Fipronil on the 5th instar of C. dubius nymphs was over 2 weeks. Four levels of Fipronil (2, 3, 5 and 10 g a. i. /ha) and five levels of 20% of Shamieling (90, 75, 60, 45, 30 g a. i. /ha) were compared in the field. The immediate effect of Fipronil was stronger than that of Shamieling. Differences among the effecw of different dosages of Fipronil were mainly shown in terms of survival rate of grasshoppers after the treatment. There was almost no difference as to control results. Twenty‐six days after the treatment, the densities of grasshoppers remained at very low level in the quadrats treated by Fipronil at 3 g a. i. /ha or more. This suggested that the lowest dosage required was 3 g a. i. /ha in the field operation.