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Zhang X.,Fujian Agriculture and forestry University | Zhang X.,Key Laboratory of Integrated Pest Management on Crops in Fujian Taiwan | Hou Y.-M.,Fujian Agriculture and forestry University | Hou Y.-M.,Key Laboratory of Integrated Pest Management on Crops in Fujian Taiwan
Insect Science | Year: 2014

One of the most invasive species worldwide, Solenopsis invicta Buren, has been described in China since 2003. Recent studies have suggested that China populations are the result of introductions from the USA; however, detailed molecular studies need to be performed in order to understand the expansion and potential multiple introductions from other countries into China. As there were populations of red imported fire ant, S. invicta in different areas and with different methods of introduction, mitochondrial cytochrome oxidase I gene was used as a marker from 12 populations in four cities in Fujian Province, China, to determine the relationship of invasion among these populations. The three most common haplotypes previously describe in invasive populations of S. invicta: H5, H22 and H36, were found in Fujian. However, frequencies in each city were different. For instance, three populations from Longyan city which invaded with waste plastics, shared haplotype H5. Populations from Xiamen city and Jinjiang city which dispersed with nursery stock, sward and scrap leather, shared haplotype H22. The population from Nanyan village of Xinluo district, Longyan city, bore haplotype H36. Mitochondrial data reveals that the invasion history of S. invicta in Fujian Province is complex, including multiple invasions probably from other provinces within China. Security measures to prevent S. invicta spreading within China are as important as from overseas. © 2013 Institute of Zoology, Chinese Academy of Sciences.


Tang B.,Fujian Agriculture and forestry University | Tang B.,Key Laboratory of Integrated Pest Management on Crops in Fujian Taiwan | Xu L.,Fujian Agriculture and forestry University | Xu L.,Key Laboratory of Integrated Pest Management on Crops in Fujian Taiwan | And 2 more authors.
BioControl | Year: 2014

Octodonta nipae (Maulik) (Coleoptera: Chrysomelidae) is currently a serious invasive pest of palm plants in southern China. Although previous studies reported that Tetrastichus brontispae Ferriere (Hymenoptera: Eulophidae) could successfully parasitize the pupae of O. nipae, little is known of the potential for T. brontispae to control this pest. To understand the interaction between T. brontispae and O. nipae, the effects of parasitoid feeding regimes, host age and density, parasitoid age and density, and cold storage on the parasitism of T. brontispae were investigated. Our results indicate that a supply of either glucose or sucrose increased the longevity and fecundity of T. brontispae. The parasitoid preferred one-day-old host pupae and its fecundity increased with increasing host or parasitoid female density. Extended cold storage negatively affected the parasitism of T. brontispae. These results demonstrate how to efficiently raise T. brontispae and will contribute to the effective management of O. nipae. © 2014, International Organization for Biological Control (IOBC).


Meng E.,Fujian Agriculture and forestry University | Meng E.,Key Laboratory of Integrated Pest Management on Crops in Fujian Taiwan | Tang B.,Fujian Agriculture and forestry University | Tang B.,Key Laboratory of Integrated Pest Management on Crops in Fujian Taiwan | And 8 more authors.
Comparative Biochemistry and Physiology Part - B: Biochemistry and Molecular Biology | Year: 2016

Most studies on the contribution of the altered immune response by endoparasitoid have been restricted to the interactions between Ichneumonoidea and their hosts, while effects of parasitism by Chalcidoidea on the hosts have rarely been characterized except some wasps such as Pteromalidae. Endoparasitoid Tetrastichus brontispae Ferrière, belonging to Eulophidae (Hymenoptera), has a great potential to control some Coleopteran beetles such as Octodonta nipae, one invasive species in southern China. However, the physiological mechanism underlying the escape from the melanotic encapsulation in O. nipae pupae has not been demonstrated. In the present study, effects of parasitism on the immune function of its pupal host O. nipae were investigated. The combining results that granulocytes and plasmatocytes could phagocytize bacteria from 2 to 48 h and granulocytes, plasmatocytes and oenocytoids were prophenoloxidase/phenoloxidase positive hemocytes indicated that granulocytes, plasmatocytes and oenocytoids were the main immunocompetent hemocytes in O. nipae pupae. Parasitism by T. brontispae resulted in a significant increase in the percentage of hemocytes viability and spreading at 96 h, growing percentage of granulocytes at 24 h but no effects on the total hemocyte counts, and an enhanced phenoloxidase activity only at 12 and 72 h while a significantly longer melanization time of the hemolymph at 96 h following parasitism. These results indicate that mixtures of systemic active and local active regulation are used for T. brontispae to escape host encapsulation in O. nipae pupae. The present study contributes to the understanding of the diversity of virulence strategies used by parasitoids. © 2016 Elsevier Inc.


Li J.-L.,Fujian Agriculture and forestry University | Li J.-L.,Key Laboratory of Integrated Pest Management on Crops in Fujian Taiwan | Tang B.-Z.,Fujian Agriculture and forestry University | Tang B.-Z.,Key Laboratory of Integrated Pest Management on Crops in Fujian Taiwan | And 4 more authors.
Bulletin of Entomological Research | Year: 2016

There is an ongoing relationship between host plants and herbivores. The nutrient substances and secondary compounds found in the host plant can not only impact the growth and development process of herbivores, but, more importantly, may also affect their survival and reproductive fitness. Vitellogenesis is the core process of reproductive regulation and is generally considered as a reliable indicator for evaluating the degree of ovarian development in females. Vitellogenin (Vg) plays a critical role in the synthesis and secretion of yolk protein. In this study, the full-length cDNA of the Vg gene in an alien invasive species, the nipa palm hispid beetle Octodonta nipae Maulik (Coleoptera: Chrysomelidae) (OnVg) was cloned and, the effect of host plant on the OnVg expression level and ovarian development was investigated. The results revealed that the OnVg was highly and exclusively expressed in adult females, but barely detectable in larvae, pupae and adult males. The relative expression level of OnVg and egg hatchability were much higher in females fed on Phoenix canariensis (their preferred host) than those fed on Phoenix roebelenii. A positive correlation relationship between OnVg expression and egg hatchability was also detected. Additionally, the anatomy of the female reproductive system showed that the ovaries of individuals fed on P. canariensis were considerably more developed than in females fed on P. roebelenii. The results may be applicable to many pest management situations through reproductive disturbance by alternating host plant species or varieties or by reproductive regulation through vitellogenesis mediated by specific endocrine hormones. Copyright © Cambridge University Press 2016


Li J.,Fujian Agriculture and forestry University | Li J.,Key Laboratory of Integrated Pest Management on Crops in Fujian Taiwan | Zhang X.,Fujian Agriculture and forestry University | Zhang X.,Key Laboratory of Integrated Pest Management on Crops in Fujian Taiwan | And 4 more authors.
Physiological Entomology | Year: 2014

Multiple mating is found in many insect taxa where both of the sexes can mate more than once. For males, this leads to the advantage of increasing their paternity by fertilizing more females. However, there is a trade-off of resource allocation between reproduction and other life-history characters. In the present study, the impact of increased mating rate on reproductive fitness of the invasive nipa palm hispid beetle Octodonta nipae Maulik (Coleoptera: Chrysomelidae) is investigated. A series of mating frequencies (i.e. 1, 5, 10, 15, 20 times) is selected from video frame playback, ranking from the minimum to maximum mating rate observed under laboratory conditions over a given time period. Fecundity parameters such as lifetime egg production, egg-hatching rate, effective oviposition period and longevity are investigated for the evaluation of reproductive efficiency. For female O. nipae, increased fecundity is correlated with the mating frequency. Females mating 15 times lay the largest number of eggs (138.82±6.87) and have a hatching rate of 47.43±4.08%. After mating 20 times, females suffer significant declines in oviposition (90.31±8.38 eggs) and egg-hatching rate (34.16±4.93%). Moreover, the population growth rate reaches a maximum in the females that mate 15 times. The results show that multiple matings in O. nipae have an intermediate optimal range within which female reproductive success is enhanced, providing empirical evidence for the existence of a trade-off between costs and benefits during copulation based on resource allocation. © 2014 The Royal Entomological Society.

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