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The Wasp Parasitoids and Their Regulating Roles To the Populations of Beet Webworm, Loxostege Sticticalis (lepidoptera: Pyralidae)

Author: TianXiaoXia
Tutor: LuoLiZhi
School: Chinese Academy of Agricultural Sciences
Course: Agricultural Entomology and Pest Control
Keywords: Meadow moth Parasitic wasps Control action Egg Of host age Biological characteristics Early parasitic Mycoparasite
CLC: S476.3
Type: Master's thesis
Year: 2010
Downloads: 105
Quote: 1
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Abstract


The meadow moth Loxostege sticticalis Linnaeus (Lepidoptera: Pyralidae) is a worldwide pest great harm of North China, Northeast and Northwest regions of agriculture and animal husbandry, and outbreaks often cause significant economic losses. In order to further clarify the role of natural enemies of the meadow moth control, revealing the the meadow moth occurrence rules to improve and improve the the meadow moth forecasting and control technical level, reducing disaster losses caused by the meadow moth, conscientiously sum up the previous existing research meadow moth parasitoids resources at home and abroad on the basis of less well understood is not clear, parasitic wasps controlling pests and other outstanding problems, the principles and methods of application of insect ecology systematic study of the the meadow moth eggs and the larvae of the parasitic bee species and their control of host populations, survey of meadow moth occurs mainly area overwintering larvae of parasitic wasps and parasitic rate, to clarify the choice of host age of the dominant species of parasitic wasps to clear some of the effects of meadow moth parasitic wasp parasitism rate environmental factors, preliminary elucidate the biological characteristics of the main types of parasitic wasps, the main results are as follows: the total collected by the Census and sentinel survey of meadow moth parasitoid 4 families, 16 species: Trichogramma Trichogramma sp.1 species (Trichogrammatidae), Apanteles Apanteles sp. Cotesia Effects of Host sp 1, Braconidae Orgilus ischnus, lean anger anger the Braconidae subfamily Orgilinae, green-eyed race Braconidae Zele chlorophthalmus ( Braconidae), seam Ichneumonidae subfamily Porizontinae 1,, in Ichneumonidae Diadegma, curved tail sp. hold edge Ichneumonidae Temelucha sp species of meadow moth Agger the Ichneumonidae Agrypon flexorius on Ling Room Ichneumonidae Mesochorus sp. (Ichneumonidae) the the grass the borer giant chest wasp Perilampus nola (Chalcididae), and two unidentified species. From the developmental stages of the meadow moth egg parasitoids 1 species, 15 kinds of larvae of parasitic wasps; view from the functionality of the parasitic wasp, early (primary) 14 kinds of parasitic wasps, heavy two kinds of parasitic wasps. Which Trichogramma the meadow moth egg parasitoids first discovered in China, while the the Apanteles other larvae of parasitic wasps first the meadow moth larvae found parasitic wasps. Finally, it describes the basic morphological characteristics of these parasitic wasps. Kangbao County, Hebei systematic study of the 2008 generation 2009 generation of field grass the borer egg and larval stages parasitoid species and their parasitic rate, clear instar larvae of the dominant species of parasitic wasps and parasitoids grass borer population control: Trichogramma natural meadow moth parasitism rate is low, about 1% or so, the Trichogramma preference choose a higher degree of maturation, egg masses smaller eggs as host; meadow moth 1-5 instar larvae can be a variety of parasitic wasp parasitism, 1, 2, 3, 4, and 5 larvae were found early parasitoids 6,8,10,8 and 8, the diversity index followed 1.18,1.23,1.64 1.61 and 1.61; parasitoid instars larvae of parasitic rate parabolic type, that is, before the age of 3 parasitic rate increased with increasing larval instar, reached the maximum to 3 age adjusted increase of age decline. Larvae parasitic rate differences between generations 2 generation larvae of parasitic only 2% -16.07% in 2008, while the 2009 generation larvae parasitic rate was 52.77% - 90.37%; different kinds of parasitic wasps on the larval instar selective and controlling action there is a greater difference. The Apanteles lean anger Braconidae seam Ichneumonidae subfamily and Diadegma bee parasitic young larvae, and host larvae die before age 3 or a cocoon buried in advance. And curved tail the Ichneumonidae 2, Diadegma bee and hold edge Ichneumonidae mainly third instar larval host. Different kinds of these host larvae can continue feeding damage, mature and buried in a cocoon and died soon to be parasitic wasps mature, and thus a larger role for the next generation of the meadow moth populations; parasitoids on the survival of host larvae Viability have varying degrees of impact, meadow moth larvae was significantly lower than normal in weight and length of the cocoon cocoon made mainly done in the host larvae and parasitic parasitism period sooner the host larvae cocoon made smaller . The study compared the 2008 second-generation 51 Hebei, Shanxi, Inner Mongolia, Jilin and Liaoning populations overwintering larvae of parasitic wasps and dominant species, to clarify these areas overwintering larvae of the parasitic wasp parasitism rate: in different parts of the meadow moth overwintering larvae of parasitic wasps number of quite different, including rich in order to of Inner Mongolia Xinganmeng other places parasitoid species (13 species), followed by Hebei Kangbao County (10) species, while the northern Shanxi, Jilin and Liaoning in the central and western regions of parasitoid species less were 3,3 and 1; different dominant species in each survey, to which anger Braconidae subfamily and meadow moth Agger Ichneumonidae, is commonly found in the various regions and the more stable the dominant species; areas surveyed parasitic Bee overwintering larvae of parasitic rates vary widely. Inner Mongolia parasitic margin ranging from 0-29.3%, eastern region of parasitic higher than the western; the northern Hebei parasitic rate from 0 to 18.2%, Shanxi Datong parasitic around was 0 to 1.1%, Jilin Tongyu Liaoning Zhangwu parasitic rate of only 1.6 and 1.1%, respectively. Research the vegetation type, the host larvae location, and pesticide application and other factors meadow moth overwintering larvae of parasitic wasp parasitism rate: investigation of the overwintering larvae within the three survey sites in Hebei and Shanxi ridge Wada parasitic rate show that parasitoid preference in the field ridges overwintering larvae as a host and parasitoid overwintering larvae in Rand's parasitic significantly higher than in Tin; overwintering larvae parasitism rate of the Inner Mongolia Xinganmeng 3 points, the results of the survey is no use of pesticides parasitic wasp parasitism rate used insecticide two locations parasitic wasp parasitism rates were less than 1/2 and 1/3. Show that the application of pesticides is a major anthropogenic factors reduce parasitic wasp parasitism rate; Hebei Kangbao four vegetation type overwintering larvae of the parasitic wasp parasitism rate survey results show that Kangbao Beiguan three crops, flax field parasitic highest rate, followed by pasture, alfalfa field again. But the county's other two townships pasture parasitic parasitism rate is relatively low, although the type of vegetation or farming certain parasitic wasp parasitism rate, but not necessarily a parasitic wasp parasitism rate level determinants. Preliminary study to clarify the the meadow moth eggs Trichogramma basic biological characteristics of parasitic wasps while several larvae, illustrates two kinds of the heavy parasitic wasps host, life and its early parasitoids control: the red eye of the meadow moth eggs bee about 9-14 days developmental duration from egg to adult emergence, sex ratio increases with the ambient temperature decreases, feathering within 24h mating, adult life is about one day in the not-dark conditions, completely protected from light conditions, the drone life can last up to four days; meadow moth the various larval Virgin parasitoids in feeding honey water conditions life in 2-5 days, longer than the life of the female bees drone life; the meadow moth huge pectoralis minor bee main and turbot room Ichneumonidae age and 3 years old meadow moth larvae re-parasitic. Wide meadow moth the giant chest wasps geographic distribution, more the host parasitic wasp species, and can be repeated parasitic the meadow moth larvae parasitic flies, covering the the meadow moth larvae age, lived significantly longer than other primary parasitoids, and has suspended animation Hebei Kangbao 3-5 instar the meadow moth larvae parasitic bees heavy parasitism rate as high as in 2009, 32.13%, 63.18 and 51.29% of the geographical distribution of the dominant species of the heavy parasitic wasps of host age on parasitism rate. Therefore, an important factor to affect the beginning of the meadow moth parasitoids and parasitic flies population dynamics. The innovation of this paper is mainly reflected in: the study found 16 kinds of meadow moth parasitoid occurred resources, describe the morphological characteristics of the various parasitic wasps, which Trichogramma the meadow moth egg parasitic wasps found for the first time variety of larvae of parasitic wasps for the first time in the world to find a parasitic grass borer larvae; reveal a the meadow moth 1-5 larvae parasitoid species and dominant species at home and abroad for the first time, a clear choice of host age of parasitoid and its meadow moth population control on the the instar larvae regulation, for the correct assessment of the parasitoid important basis; systems research revealed 51 large overwintering larvae populations occurred parasitic rate, clear the different occur hazard zones meadow moth parasitic parasitism rate anger Braconidae subfamily and the meadow moth Agger Ichneumonidae of meadow moth occurs mainly in the common types of hazard zone; research to clear vegetation type, location and chemical control of farmland host larvae of parasitic wasps parasitic the impact of the rate. The parasitoid the ridge larvae parasitic high ratio Tian, ??and the negative impact of chemical control on raw parasitism rate most significant.

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CLC: > Agricultural Sciences > Plant Protection > A variety of control methods > Biological control > The use of parasitic insects
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