The oak lace bug, Corythucha arcuata (Hemiptera: Tingidae), was first identified as an invasive pest in Europe in northern Italy in 2000 and since then it has spread rapidly, attacking large forested areas in European countries. Evidence of four entomopathogenic fungi that are naturally occurring on C. arcuta has been detected in infested pedunculate oak forests in eastern Croatia: Beauveria pseudobassiana, Lecanicillium pissodis, Akanthomyces attenuatus and Samsoniella alboaurantium. These pathogenic species could facilitate biological control strategies against C. arcuata.
Table of Contents [Hide]
A total of 12 fungal isolates were obtained from naturally infected C. arcuata adults collected from the field. On the basis of morphological features, we identified these species as Beauveria pseudobassiana (S.A. Rehner and Humber), Lecanicillium pissodis (Kope and I. Leal), Akanthomyces attenuatus (Zare and W. Gams) (Spatafora, Kepler and B. Shrestha) and Samsoniella alboaurantium (G. Sm.) (Mongkols., Noisrip., Thanakitp., Spatafora and Luangsa-ard) (Figure 1a–d). B. pseudobassiana was the most commonly detected fungus with eight isolates altogether (BBC1, BBC2, BBC3, BBC4, BBC6, BBC8, BBC10 and BBNK1). Isolates BBNK2 and BBC7 were identified as L. pissodis, isolate BBC9 as A. attenuatus, and isolate BBC5 was identified as S. alboaurantium.
Figure 1. (a) Beauveria pseudobassiana: (a1) Infected adult of C. arcuata. (a2) Conidiophores. (a3) Colony on potato dextrose agar (PDA) at 14 d. obverse. (a4) Colony on PDA at 14 d. reverse. (a5) Conidia. (a6) Conidiogenous cells. (b) Akanthomyces attenuatus: (b1) Infected adult of C. arcuata. (b2) Conidiophores. (b3) Colony on PDA at 14 d. obverse. (b4) Colony on PDA at 14 d. reverse. (b5) Conidia. (b6) Conidiogenous cells. (c) Lecanicillium pissodis: (c1) Infected adult of C. arcuata. (c2) Conidiophores. (c3) Colony on PDA at 14 d. obverse. (c4) Colony on PDA at 14 d. reverse. (c5) Conidia. (c6) Conidiogenous cells. (d) Samsoniella alboaurantium: (d1) Infected adult of C. arcuata. (d2) Conidiophores. (d3) Colony on PDA at 14 d. obverse. (d4) Colony on PDA at 14 d. reverse. (d5) Conidia. (d6) Conidiogenous cells.
The entry is from 10.3390/insects11100679