Investigations on the Genus Rhizoecus (Hemiptera: Rhizoecidae) with Description of Two New Species from South America

Kaydan, Mehmet Bora; Benedicty, Zsuzsanna Konczné; Kondo, Takumasa; Ramos-Portilla, Andrea Amalia; Szita, Éva

doi:10.1007/s13744-019-00681-w

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…Hardiyanti et al [6] reported R. amorphophalli attack the porang tuber in India. They suck cell sap from the elephant foot yam tubers, and the severely infested deformed tubers find no place in market, nor are accepted for cooking [9,17,20].…”

Section: The Symptoms Of Mealybug Infested Porang Tubermentioning

confidence: 99%

New Report of Oriental Mealybug Rhizoecus Amorphophalli Betrem (Hemiptera: Pseudococcidae) in Amorphophallus Muelleri Tubers in Indonesia

Baliadi,

Mejaya,

Soehendi

et al. 2023

BIO Web Conf.

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Since 2020 porang (Amorphophallus muelleri Blume) has been declared as an important commercial crop grown in Indonesia. Recently, porang tubers a coated of a distinct white waxy substance was observed at seed storage. The symptoms pose a threat to tuber vigour quality due to the intensive infestation on stored tubers. This sap- sucking insect sucks the juice leading to desiccation and shrivelling of tubers. This study aims to identify the sap- sucking insect pest attacks the storage porang tubers. The studies carried out at ILETRI. Identification of the caused insect species was done by observing symptoms visually, morphological identification of adult females using Compound microscope Olympus Bx43 in 40 X magnification, and tuber germination and growth of 250 infested tubers in the field. Regarding to the specific symptoms whose soft body coated of a distinct white waxy substance and morphological measurement of the average length of the adult females (862.62±46.3 μm with range between 764 - 904 μm), it’s supposed caused by mealybug in Rhizoecus amorphophalli (Hemiptera:Pseudococcidae). Our founding revealed that R. amorphophalli is first discovered as causal agent of a mealybug pest of porang in Indonesia and turned out to be very detrimental because their infestation caused 90 percent of infested porang tubers unable to germinate and grow.

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Section: The Symptoms Of Mealybug Infested Porang Tubermentioning

confidence: 99%

New Report of Oriental Mealybug Rhizoecus Amorphophalli Betrem (Hemiptera: Pseudococcidae) in Amorphophallus Muelleri Tubers in Indonesia

Baliadi,

Mejaya,

Soehendi

et al. 2023

BIO Web Conf.

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“…Most of the root mealybugs live in the soil, feeding on the roots of different plants but it is usually difficult to determine which plant is their actual host (Kaydan et al, 2019;Kozár & Konczné Benedicty, 2007). Rhizoecus albidus Goux, 1942, which is widely distributed in Europe and occurs also in Morocco, Kazakhstan and China as well as in the far eastern region of Russia (García Morales et al, 2016), is a new species to Polish fauna (Kalandyk-Kołodziejczyk, unpublished data).…”

Section: Introductionmentioning

confidence: 99%

Ovary structure and symbiotic associates of a ground mealybug, Rhizoecus albidus (Hemiptera, Coccomorpha: Rhizoecidae) and their phylogenetic implications

Szklarzewicz

Kalandyk-Kołodziejczyk

Michalik

2022

Journal of Anatomy

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The ovary structure and the organization of its symbiotic system of the ground mealybug, Rhizoecus albidus (Rhizoecidae), were examined by means of microscopic and molecular methods. Each of the paired elongated ovaries of R. albidus is composed of circa one hundred short telotrophic-meroistic ovarioles, which are radially arranged along the distal part of the lateral oviduct. Analysis of serial sections revealed that each ovariole contains four germ cells: three trophocytes (nurse cells) occupying the tropharium and a single oocyte in the vitellarium. The ovaries are accompanied by giant cells termed bacteriocytes which are tightly packed with large pleomorphic bacteria. Their identity as Brownia rhizoecola (Bacteroidetes) was confirmed by means of amplicon sequencing and fluorescence in situ hybridization techniques. Moreover, to our knowledge, this is the first report on the morphology and ultrastructure of the Brownia rhizoecola bacterium. In the bacteriocyte cytoplasm bacteria Brownia co-reside with sporadic rod-shaped smaller bacteria, namely Wolbachia (Proteobacteria: Alphaproteobacteria). Both symbionts are transmitted to the next generation vertically (maternally), that is, via female germline cells. We documented that, at the time when ovarioles contain oocytes at the vitellogenic stage, these symbionts leave the bacteriocytes and move toward the neck region of ovarioles (i.e. the region between tropharium and vitellarium). Next, the bacteria enter the cytoplasm of follicular cells surrounding the basal part of the tropharium, leave them and enter the space between the follicular epithelium and surface of the nutritive cord connecting the tropharium and vitellarium. Finally, they gather in the deep depression of the oolemma at the anterior pole of the oocyte in the form of a 'symbiont ball'. Our results provide further arguments strongly supporting the validity of the recent changes in the classification of mealybugs, which involved excluding ground mealybugs from the Pseudococcidae family and raising them to the rank of their own family Rhizoecidae.

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New records of Ripersiella (Tinsley) (Hemiptera: Coccomorpha: Rhizoecidae) species and identification key of Rhizoecidae in Italy

Mazzeo,

Ricupero,

Campo

et al. 2023

Phytoparasitica

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Biological invasions are one of the major constraints worldwide because of the economic and environmental consequences they may pose. Root mealybugs (Hemiptera: Coccomorpha: Rhizoecidae) are continuously transported worldwide with plant soil because of their cryptic behavior. In this study it was reported the presence of Ripersiella multiporifera Jansen in Sicily for the first time and discussed the presence of R. maasbachi (Jansen) and R. hibisci (Kawai & Takagi) in Italy. A key is provided to identify the species of Rhizoecidae currently known in Italy. The species were identified by morphological features and characterized molecularly by using a partial COI mitochondrial gene. Our report alerts the presence of alien root mealybugs in Italy. R. hibisci is a quarantine species listed in Annex IIA of EU Regulation 2019/2072.

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Investigations on the Genus Rhizoecus (Hemiptera: Rhizoecidae) with Description of Two New Species from South America

Cited by 5 publications

References 11 publications

New Report of Oriental Mealybug Rhizoecus Amorphophalli Betrem (Hemiptera: Pseudococcidae) in Amorphophallus Muelleri Tubers in Indonesia

New Report of Oriental Mealybug Rhizoecus Amorphophalli Betrem (Hemiptera: Pseudococcidae) in Amorphophallus Muelleri Tubers in Indonesia

Ovary structure and symbiotic associates of a ground mealybug, Rhizoecus albidus (Hemiptera, Coccomorpha: Rhizoecidae) and their phylogenetic implications

New records of Ripersiella (Tinsley) (Hemiptera: Coccomorpha: Rhizoecidae) species and identification key of Rhizoecidae in Italy

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