Population dynamics of Woolly Aphid, Eriosomalanigerum, Hausmann (Hemiptera Aphididae) and its' natural enemies in Apple Orchardin Thimphu Valley, Bhutan

พลวัตรประชากรของเพลี้ยอ่อน Woolly aphid, Eriosoma lanigerum Haumann (Hemiptera Aphididae) และศัตรูธรรมชาติในสวนแอปเปิ้ล ในหุบเขาทิมพู ประเทศภูฏา

Name: Sonam Dorji N

keyword: Insect natural enemie

ThaSH: Maejo University -- Thesis

; woolly aphid

ThaSH: Biological control

ThaSH: การควบคุมโดยชีววิทยา

ThaSH: Insect biochemistry

ThaSH: Insect pests

ThaSH: Insect pests -- Biological control

; เพลี้ยอ่อนแอปเปิ้ล

; แมลงศัตรูธรรมชาติ

Abstract: This study aimed to evaluate the population change of woolly aphid (WA), Eriosoma lanigerum (Hemiptera: Aphididae) and associated insect natural enemies in apple orchards located at Thimphu valley, Kingdom of Bhutan from April to October 2018. The study was conducted in two apple orchards, Hongtsho-2 and Kausumche-3 (coordinates: 27?28?20?N - 89?38?10?E, altitude from 2,248 to 2,648 meters, Temp. 5-30 ?C. Data was collected randomly from five trees comprising sample unit of four terminal shoots (approx. 10 cm) each tree. Species confirmation and population growth of woolly aphid and its natural enemies were examined at both field and laboratory levels twice a month. The aphid densities were observed higher during the growing season (June-September) when tender shoots and plants resource are abundant. During the apple growing season significantly an Independent sample t-test revealed that abundance of WA infestation was higher in Hongtsho-2 than Kausumche-3 averaging 1.40 + 0.30 and 1.27 + 0.38 aphis per tree respectively (t= .94, P= 4.3410, P=0.0001). Appearance was noted of seven species insect natural enemies associated with WA, including one parasitoid, Aphelinus mali (Hymenoptera: Aphelinidae); and six predators, including coccinellids, Coccinella transversoguttata, Harmonia sedecimnotata and H. dimidiata (Coleoptera: Coccinellidae); syrphids, Syrphus opinator and Heringia calcarata (Diptera: Syrphidae); and a green lacewings, Chrysoperla sp. (Neuroptera: Chrysopidae). These were revealed according to WA population growth in density dependent manner. Additionally, in both the orchards A. mali was the most effective natural enemy with 12 - 34 percent parasitism. This parasitic insect should be subjected to further investigation for augmentative and conservative biological control of E. lanigerum in apple orchards

Maejo University. Library

Address: Chiang Mai

Email: mjudc@mju.ac.th

Name: Samaporn Saengyot

Role: Chair

Name: Nopporn Boonplod

Role: Committee

Name: Phanit Nakayan

Role: Committee

Name: Chatchavijk Thanomthin

Role: Program Chair

Created: 2019

Modified: 2021-06-22

Issued: 2021-06-17

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: 595.75 S698p 2019

595.75

eng

Spatial: Bhutan

DegreeName: Master of Science

Level: Master's Degree

Descipline: Agriculture

Grantor: Maejo University

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