The predation of Menochilus sexmaculata (Coleoptera: Coccinellidae) to Thrips hawaiiensis (Thysanoptera: Thripoidae) in the laboratory
Author of the article:LI Shan-Guang;FU Bu-Li; QIU Hai-Yan;YANG Shi-You;MA Xiao-Tong; ZHOU Shi-Hao;TANG Liang-De;ZHANG Fang
Author's Workplace:The ministry of Agriculture Key Laboratory of Integrated Pest Management of Tropical Crops, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Engineering Research Center of Tropical Crops Pest Biological Control, Haikou 571101, China; Boao Agricultural Service Center, Qionghai 571434, China; Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China; College of Plant Science and Technology of Huazhong Agricultural University, Wuhan 430070, China
Key Words:Menochilus sexmaculata; Thrips hawaiiensis; predation; biocontrol
Abstract:
[Objectives] This study aims to determine the predation of Menochilus sexmaculata against Thrips
hawaiiensis and to evaluate the potential use of the ladybugs in thrips
control programs. [Results] Laboratory experiments were performed to study
the functional response, searching
efficiency and interfere response of M.
sexmaculata to T. hawaiiensis. [Results] The
predation of M. sexmaculata showed the Holling-type II functional responses against the
thrips. The 4th-instar larvae and adult of M. sexmaculata showed the highest
predation capacity to 2nd-instar nymph of T. hawaiiensis,
with a'/Th for 578.04 and 1 852.80 individuals,
with 1/Th for 400.00 and 2 000.00 individuals per day,
respectively. The
predation rate of M. sexmaculata was positively related with prey densities of T. hawaiiensis, while its searching efficiency
was negatively associated with prey densities. Furthermore, the elder larvae and adult
of M. sexmaculata were more effective in searching for their preys
than other predator ages. The predation on T. hawaiiensis was
significantly influenced by the predator density of M. sexmaculata, showing that the predation rate decreased with
increasing the predator density. This suggests that the interfere response exists in the
predation of M. sexmaculata on T. hawaiiensis, and
this could
be described by Hassell-model equation. [Conclusion] These findings
represent that M. sexmaculata exhibit a great
potential for its use in control of this special thrips pest, providing a scientific basis on
biological control programs and nature enemy protection.