Enhancing Tea Leaf Disease Identification with Lightweight MobileNetV2

Diseases in tea trees can result in significant losses in both the quality and quantity of tea production.Regular monitoring can help to prevent the occurrence of large-scale diseases in tea plantations.However,existingmethods face challenges such as a high number of parameters and low recognition accuracy,which hinders their application in tea plantation monitoring equipment.This paper presents a lightweight I-MobileNetV2 model for identifying diseases in tea leaves,to address these challenges.The proposed method first embeds a Coordinate Attention(CA)module into the originalMobileNetV2 network,enabling the model to locate disease regions accurately.Secondly,a Multi-branch Parallel Convolution(MPC)module is employed to extract disease features across multiple scales,improving themodel’s adaptability to different disease scales.Finally,the AutoML for Model Compression(AMC)is used to compress themodel and reduce computational complexity.Experimental results indicate that our proposed algorithm attains an average accuracy of 96.12%on our self-built tea leaf disease dataset,surpassing the original MobileNetV2 by 1.91%.Furthermore,the number of model parameters have been reduced by 40%,making itmore suitable for practical application in tea plantation environments.

Polycephalomycetaceae,a new family of clavicipitoid fungi segregates from Ophiocordycipitaceae

Clavicipitoid fungi comprise three families,namely Clavicipitaceae,Cordycipitaceae,and Ophiocordycipitaceae.They are found worldwide and are specialized pathogens of invertebrate,plant and fungal hosts.Over the last decade,morphology-and phylogeny-based studies on clavicipitoid fungi have increased.The latter have revealed that Polycephalomyces,Perennicordyceps and Pleurocordyceps consistently cluster together.These genera are currently considered as members of Ophiocordycipitaceae.Nonetheless,information with regard to their diversity and ecology remains sparse.To fill this gap,we collected 29 fresh specimens from insect and fungal substrates from tropical and subtropical evergreen forests in Thailand and southwestern China.We performed detailed morphological analyses and constructed photoplates for all isolated fungi.We used extensive taxon sampling and a dataset comprising internal transcribed spacer gene region(ITS),small subunit ribosomal RNA gene region(SSU),large subunit rRNA gene region(LSU),translation elongation factor 1-alpha gene region(TEF-1α),RNA polymerase II largest subunit gene region(RPB1)and RNA polymerase II second largest subunit(RPB2)to infer order-,family and genus-level phylogenetic trees.Based on these biphasic analyses,we segregate Polycephalomyces,Perennicordyceps,and Pleurocordyceps from Ophiocordycipitaceae and introduce the new family Polycephalomycetaceae to accomodate these three genera.The majority of species in this family have a vast range of insect and fungal hosts.The sexual morph of Polycephalomycetaceae has stromatic ascomata,long stipes,thick peridium,and cylindrical secondary spores.The asexual morph is characterized by colonies on the host surface or synnemata with stipes on the host,one or two types of phialides,and cylindrical to fusiform conidia.We expand the number of taxa in the new family by introducing seven new species(Polycephalomyces albiramus,Perennicordyceps lutea,Pleurocordyceps parvicapitata,Pleurocordyceps lanceolatus,Pleurocordyceps nutansis,Pleurocordyceps heilongtanensis,Pleurocordyceps vitellina),nine new hosts,and one new combination(Perennicordyceps elaphomyceticola).The results herein hint at a high level of diversity for Polycephalomycetaceae.Future investigations focusing on obtaining additional collections and specimens from different geographical areas would help to reveal not only the extent of the group’s diversity,but also resolve its deeper phylogenetic placement.

Taxonomic studies of some often over-looked Diaporthomycetidae and Sordariomycetidae

Sordariomycetes is an earlier-introduced and one of the widely distributed class of Ascomycota.The class was initially clas-sified based on morphology in having inoperculate and unitunicate asci.With the development of DNA based phylogenetic analysis,several undetermined or polyphyletic members of Sordariomycetes were reclassified.However,not all species belonging to this class have been sequenced and analyzed.There are a number of species,especially those old and poorly studied ones which have never been sequenced before and not even recollected again for further taxonomic verification.One of the main objective in this study is to revise and update the taxonomy of several well-known early and poorly studied spe-cies whose classification are still obscure.Herein,we re-examined the type materials and/or authentic specimens together to explore 74 relatively poorly-studied genera,which mainly belong to Boliniales,Calosphaeriales,Chaetosphaeriales,Jobellisiales,and Sordariales classified under Diaporthomycetidae and Sordariomycetidae.We provide descriptions,notes,figures and/or drawings and discussed their phylogenetic relationships.As a result,the monotypic Jobellisiales is transferred from Hypocreomycetidae to Diaporthomycetidae.Based on phylogenetic analysis,the polyphyletic Lasiosphaeriaceae is divided into five families,Bombardiaceae(Apodospora,Bombardia,Bombardioidea,Fimetariella and Ramophialophora),Lasiosphaeriaceae(Anopodium,Bellojisia,Corylomyces,Lasiosphaeria,Mammaria and Zopfiella),Lasiosphaeridaceae(Lasiosphaeris),Strattoniaceae(Strattonia)and Zygospermellaceae(Episternus and Zygospermella).In addition,a new family Neoschizotheciaceae is established based on Neoschizothecium.Analysis of the type species of Boothiella,Stel-latospora,Sulcatistroma and Tengiomyces placed them in Sordariaceae,Chaetomiaceae,Hypocreales and Coronophorales,respectively.We classify the genera lacking molecular data based on their morphology and expect them to be recollected;that is,Kacosphaeria in Calosphaeriales;Arnium,Biconiosporella,Camptosphaeria,Diffractella,Emblemospora,Eosphaeria,Periamphispora,Synaptospora and Tripterosporella in Sordariales;Conidiotheca in Sordariomycetes;Copromyces,Effetia,Endophragmiella and Tulipispora are accommodated in Ascomycota.Besides,we establish a new genus Neoschizothecium based on phylogenetic analysis.New combinations proposed:Camaropella amorpha,Cam.microspora,Cam.plana,Clad-orrhinum grandiusculum,Cla.leucotrichum,Cla.terricola,Cla.olerum,Helminthosphaeria plumbea,Immersiella hirta,Jugulospora minor,Lasiosphaeris arenicola,Neoschizothecium aloides,Neo.carpinicola,Neo.conicum,Neo.curvisporum,Neo.fimbriatum,Neo.glutinans,Neo.inaequale,Neo.minicaudum,Neo.selenosporum,Neo.tetrasporum,Neurospora autosteira,Podospora brunnescens,P.flexuosa,P.jamaicensis,P.hamata,P.macrospora,P.spinosa,Strattonia petrogale and Triangularia microsclerotigena,T.nannopodalis,T.praecox,T.samala,T.tarvisina,T.unicaudata,T.yaeyamensis.New epithets are proposed for Apiorhynchostoma apiosporum and Podospora dacryoidea.