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New Potential Strains For Controllingspodoptera Frugiperdain China:Cordyceps Cateniannulataandmetarhizium Rileyi

BIOCONTROL(2020)

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Abstract
Spodoptera frugiperda(J.E. Smith) (Lepidoptera: Noctuidae), an invasive pest, was identified in China in early 2019. This pest is a serious threat to food, especially maize production. Consequently, it is necessary to use biological control to reduce the damage caused byS. frugiperda.Furthermore, it is important to find new entomopathogenic fungi or a local wild parasitic isolate to control this pest. Here, one fungus was found infectingS. frugiperdalarvae in China. Isolated colonies were identified asMetarhizium rileyi(Farlow) Kepler, S.A. Rehner & Humber (Hypocreales: Clavicipitaceae) using morphological and molecular methods. Bioassay studies with purified conidial suspensions further confirmed the infectivity to 4th instarS. frugiperdalarvae. The results showed that noS. frugiperdalarvae survived after being treated with a spore suspension ofM. rileyiGZUIFR-LS01 orCordyceps cateniannulata(Z.Q. Liang) Kepler, B. Shrestha & Spatafora (Hypocreales: Cordycipitaceae) GZUIFR-S22 for seven days at 90% RH. However, at 75% RH, 13% and 48% of larvae survived after seven days of exposure toM. rileyiGZUIFR-LS01 andC. cateniannulataGZUIFR-S22, respectively. Additionally,C. cateniannulatastrain GZUIFR-S22 led to a survival rate of less than 50% inS. frugiperdalarvae after two days of treatment at 90% RH. This is the first report of the pathogenicity ofC. cateniannulataagainstS. frugiperda.
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Key words
Entomopathogenic fungi,Biological control,Metarhizium rileyi,Cordyceps cateniannulata,Cordycipitaceae,Hypocreales,Spodoptera frugiperda,Pathogenicity
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