Efficacy of beauveria bassiana against the corn leaf aphid, rhopalosiphum maidis (hemiptera: aphididae)

พฤติกรรมการเดินทางสะท้อนอัตลักษณ์ (Identity Reflection Travel Behavior): การพัฒนาทักษะ ในการเผชิญกับปัญหาความเครียดสําหรับ Adult Third Culture Kids

Name: Nay Lin Oo

keyword: Beauveria bassiana

Classification :.DDC: 632.96

; Corn leaf aphid

ThaSH: Corn -- Diseases and pests

; Rhopalosiphum maidis

Abstract: Three experiments were conducted to evaluate the efficacy of an entomopathogenic fungus, Beauveria bassiana against the corn leaf aphid, Rhopalosiphum maidis (Hemiptera: Aphididae), under laboratory, greenhouse and field conditions. At Maejo University Biological Control Technology Learning Center (MJU-BCTLC), different concentrations of B. bassiana ranging from 1 x 10' to 1 x 100 spores per ml were used with five replications in completely randomized design (CRD) from August to October 2015. The results revealed that all concentrations of B. bassiana tested were found pathogenic to the corn leaf aphid. At three days after treatment (DAT), the mortality obtained ranged from 43.60 to 85.40 percent. The results showed that the mortality was highest at 85.40 20.02% at 1 x 10 spores per ml and lowest at 43.60 + 43.87% at the concentration of 1 x 10° spores per ml. However, the percent mortality at different concentrations were not significantly different compared to the control. The LC50 of B. bassiana against the corn leaf aphid was 1.2 x 10° spores per ml and the LT50 ranged from 1.36 to 2.02 days. Greenhouse trial was conducted to assess the efficacy of all concentrations used in laboratory bioassay on the natural infestation of corn leaf aphid with five replications in randomized complete block design (RCB) at the greenhouse of Faculty of Agricultural Production, Maejo University from March to June 2016. The results showed that the aphid population was firstly observed at 58 days after sowing (DAS) in all treated and untreated plants. The higher concentrations of B. bassiana from 10 1 x 10° to 1 x 10° spores per ml reduced the aphid population within two weeks and after 65 DAS the aphid population declined until the end of cropping period. However, the lower concentrations from 1 x 10 to 1 x 10° spores per ml could not reduce aphid population. At weekly intervals it was noted all the treatments were significantly different from each other and the higher mean number of aphid population about 970 aphids per plant was observed in the control. At all weekly intervals the mean number of aphid population ranged from 1 to 970 aphids per plant. Under field condition, four concentrations of B. bassiana ranging from 1 x 10' to 1 x 10 spores per ml were used to determine the effect of B. bassiana to control corn leaf aphids during the same period of the greenhouse trial. From 58 to 72 DAS aphid infestation was low from 1.67 to 23.67 aphids per plant. After that, no aphid population was recorded due to successive rain. Based on the results of all conditions, the higher concentrations from 1 x 10° to 1 x 10 spores per ml of B. bassiana can be used as a biocontrol agent to control corn leaf aphid and as a key component in the insect pest management program as well as in organic agriculture.

มหาวิทยาลัยแม่โจ้. สำนักหอสมุด

Address: เชียงใหม่

Email: mjudc@mju.ac.th

Name: Sureewan Mekkamol

Role: Advisory Committee

Name: Kamonnate Srithi

Role: Advisory Committee

Name: Samaporn Saengyot

Role: Advisory Committee Chairman

Name: Samaporn Saengyot

Role: Program Chairperson

Created: 2017

Modified: 2018-08-08

Issued: 2018-08-04

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: Th 632.96 N333e

eng

Spatial: Thailand

DegreeName: Master of Science in Agricultural

Level: Master's Degree

Descipline: Master of Science in Agriculture (Plant Protection)

Grantor: Maejo University

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	abstract.pdf	2.18 MB	22	2025-07-13 22:17:08
2	fulltext.pdf	15.6 MB	5	2025-07-13 22:17:26

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