Hasibuan, Rosma (2016) Pathogenicity of Entomopathogenic Fungi To Soybean Aphids Aphis glycines (Hemiptera: Aphididae). In: The 6th International Meeting for the Development of Integrated Pest Management (IPM) in Asia and Africa” at Niigata University, Niigata, Japan on March 2-3, 2016., March 2-3, 2016, Niigata University, Niigata, Japan. (Unpublished)

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Abstract

The soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is a major pest of soybean, Glycine max (L.). Merr., that significantly reduces yield throughout soybean-growing areas of all over the country. One of the potential control strategies of this pest is to use entomopathogenic fungi. Beauveria bassiana (Balsamo) VuelleminVuill and Metarrhizium anisopliae (Metschnikoff) Sorokin are the entomopathogenic fungi (EPF) that occur naturally in the environment and have a potential as biological control agents against many insect pests including the soybean aphid. Three fungal isolates of B. bassiana (Tegineneng, Sumberjaya, and Tanggamus) and isolates of M. anisopliae (Gading Rejo, Tegineneng, and UGM) were tested to measure spore production and germination and also their pathogenicity against the soybean aphids under laboratory conditions. The results showed that spore production ranged from 9.9 x 106 to 13.28 x106 conidia ml-1 and 1.27 x 107 to 2.27 x 107 conidia ml-1 for the three B. bassiana and M. anisopliae isolates, respectively. Spore viability after incubation for 24 h at 20 °C ranged from 64.76 to 82.25% for the three isolates of B. bassiana and from 58.12 to 67.40% for M. anisopliae isolates tested. Moreover, the pathogenicity bioassays showed that both B. bassiana and M. anisopliae fungi were capable to cause infection and developed mycosis on soybean aphids. Mortality ranged from 82.91 to 93.7% and 74.44 to 85.55% among the three isolates of B. Bassiana and M. anisopliae, respectively. Highly mortality values indicate that some isolates of B. bassiana and M. anisopliae are highly pathogenic to the soybean aphid. In addition, the lethal concentration for 50% mortality (LC50 ) value for the most pathogenic isolate of B. bassiana was 4.5 × 104 conidia ml-1, whereas the LC50 value for M. Anisoplia was 8.9 × 105 conidia ml-1. The lethal time for 50% mortality (LT50) values were obtained in the highest spore concentration of 108 conidia ml-1 of B. bassiana and M. Anisopliae as 3.64 and 5.54 days, respectively. The lower LC50 and LT50 values of B. bassiana indicate its higher virulence compared to M. anisopliae. This study demonstrates the prospects of the two entomopathogenic fungi for the management of the soybean aphid.

Item Type:	Conference or Workshop Item (Keynote)
Subjects:	A General Works > AS Academies and learned societies (General)
Divisions:	Fakultas Pertanian (FP) > Prodi Proteksi Tanaman
Depositing User:	Prof.Dr.Ir Rosma Hasibuan
Date Deposited:	20 Jul 2017 08:57
Last Modified:	20 Jul 2017 08:57
URI:	http://repository.lppm.unila.ac.id/id/eprint/2913

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