Latest News on Curculionidae Research: Dec – 2019

THE EVOLUTION OF AGRICULTURE IN BEETLES (CURCULIONIDAE: SCOLYTINAE AND PLATYPODINAE)

Beetles within the weevil subfamilies Scolytinae and Platypodinae are unusual in that they burrow as adults inner bushes for feeding and oviposition. Some of these beetles are known as ambrosia beetles for his or her obligate mutualisms with asexual fungi—called ambrosia fungi—which are derived from plant pathogens in the ascomycete organization referred to as the ophiostomatoid fungi. Other beetles in those subfamilies are known as bark beetles and are associated with free‐living, pathogenic ophiostomatoid fungi that facilitate beetle attack of phloem of timber with resin defenses. Using DNA sequences from six genes, which include each copies of the nuclear gene encoding enolase, we done a molecular phylogenetic take a look at of bark and ambrosia beetles throughout those  subfamilies to set up the fee and direction of modifications in life histories and their consequences for diversification. The ambrosia beetle habits have developed again and again and are unreversed. [1]

A revision to the genera Rhynchophorus and Dynamis (Coleoptera : Curculionidae)

A taxonomic observe turned into made at the genera Rhynchophorus and Dynamis of the weevil circle of relatives Curculionidae which incorporates all the species acknowledged to arise within the world. The bibliography lists all of the crucial papers posted to this point at the taxonomy and bionomics of those weevils. A full synonymy is given for each species with the right literature stated within the bibliography. Eight species of Rhynchophorus–barbirostris, glabrirostris, indostanus, kaupi, montrouzieri, pascha, rubrocinctus, signaticollis – and  species of Dynamis–politus, germari–are located in synonymy. Keys to genera, species, and recognized pupae and larvae are given. A subgenus Rhynchodynamus Heller is expanded to ordinary rank. Twenty- species are handled, twelve of which redescribed absolutely and ten of which might be defined as new. [2]

Biology and integrated pest management for the banana weevil Cosmopolites sordidus (Germar) (Coleoptera: Curculionidae)

The banana weevil Cosmopolites sordidus (Germar) is the most vital insect pest of bananas and plantains (Musa spp.). The larvae bore in the corm, reducing nutrient uptake and weakening the steadiness of the plant. Attack in newly planted banana stands can lead to crop failure. In mounted fields, weevil damage can result in decreased bunch weights, mat die-out and shortened stand life. Damage and yield losses tend to increase with time. This paper reviews the studies at the taxonomy, distribution, biology, pest popularity, sampling techniques, and incorporated pest control (IPM) of banana weevil. Salient features of the weevil’s biology consist of nocturnal activity, lengthy lifestyles span, restricted mobility, low fecundity, and sluggish populace boom. The adults are unfastened dwelling and most often related to banana mats and reduce residues. [3]

Revealing the respiratory system of the coffee berry borer (Hypothenemus hampei; Coleoptera: Curculionidae: Scolytinae) using micro-computed tomography

The coffee berry borer (Hypothenemus hampei) is the most economically important insect pest of espresso globally. Micro-computed tomography (micro-CT) was used to reconstruct the breathing gadget of this species for the primary time; this is the smallest insect (ca. 2 mm long) for which this has been finished to this point. Anatomical info of the spiracles and tracheal tubes are defined, photographs offered, and new phrases introduced. The general quantity and the relationship between tracheal lumen diameter, duration and quantity also are provided. The general period of the tracheal tubes are seventy times the period of the entire animal. Videos and a 3D version for use with cellular devices are blanketed as supplementary data; these could be useful for destiny studies and for teaching insect anatomy to college students and the general public in general. [4]

Activity Rhythm of the Banana Weevil, Cosmopolites sordidus Germar (Coleoptera: Curculionidae)

Laboratory and field investigations in Kenya, East Africa, on the interest rhythm of the banana weevil, Cosmopolites sordidus Germar indicated a nocturnal lifestyle for this pest. This behavior persisted even under steady darkish (DD) circumstance in the course of free-running trials. This proved an endogenously managed, real circadian rhythm for the pest. Activity generally began sharply with the begin of scotophase (6 pm) achieving top at about 9pm and keeping that level till about 4am, and step by step declined with the begin of photophase (6am). Light changed into a main deterrent to the pest, as constant mild (LL) situation absolutely suppressed hobby. Temperature and mild intensity correlated negatively with weevil interest. [5]

Reference

[1] Farrell, B.D., Sequeira, A.S., O’Meara, B.C., Normark, B.B., Chung, J.H. and Jordal, B.H., 2001. The evolution of agriculture in beetles (Curculionidae: Scolytinae and Platypodinae). Evolution, 55(10), (Web Link)

[2] Wattanapongsiri, A., 1965. A revision to the genera Rhynchophorus and Dynamis (Coleoptera: Curculionidae). (Web Link)

[3] Gold, C.S., Pena, J.E. and Karamura, E.B., 2001. Biology and integrated pest management for the banana weevil Cosmopolites sordidus (Germar)(Coleoptera: Curculionidae). Integrated Pest Management Reviews, 6(2), (Web Link)

[4] Revealing the respiratory system of the coffee berry borer (Hypothenemus hampei; Coleoptera: Curculionidae: Scolytinae) using micro-computed tomography
Javier Alba-Tercedor, Ignacio Alba-Alejandre & Fernando E. Vega
Scientific Reports volume 9, Article number: 17753 (2019) (Web Link)

[5] P. Uzakah, R. (2018) “Activity Rhythm of the Banana Weevil, Cosmopolites sordidus Germar (Coleoptera: Curculionidae)”, Journal of Experimental Agriculture International, 21(6), (Web Link)

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