Dysmicoccus walkeri (Newstead)

MOGHADDAM, MASUMEH & WATSON, GILLIAN W., 2022, The Scale Insects Of Iran (Hemiptera: Coccomorpha) Part 2 The Mealybugs (Pseudococcidae And Rhizoecidae) And Putoidae, Zootaxa 5126 (1), pp. 1-169 : 48-49

Dysmicoccus walkeri (Newstead)

( Fig. 16 , distribution map Fig. 67 C )

Dactylopius walkeri Newstead, 1891: 164 . Pseudococcus kazanskyi Borchsenius, 1937: 44 . Pseudococcus rectus Borchsenius, 1949: 136 . Dysmicoccus glandularis Bazarov, 1977: 65 . Dysmicoccus badachshanicus Nurmamatov, 1978: 61 .

Field characteristics: Found on grasses. Body elongate oval, about 2.5–4.0 mm long and 1.0– 1.7 mm wide, with segmentation distinct. Antennae and legs pale yellow-brown, covered with dense white powdery wax; cottony wax appendages on margins stout, with the posteriormost six longer and stouter than the others, the penultimate pair longest (as long as body width) and very stout ( Williams 1962).

Microscopic diagnosis: Slide-mounted adult female elongate oval. Anal lobes poorly developed. Antennae each with 8 segments. Legs well developed; hind leg with translucent pores on coxa. Cerarii numbering 15 pairs; anal lobe cerarii each containing 2 enlarged conical setae, about 7 or 8 auxiliary setae and numerous trilocular pores, all situated on a sclerotized area. Anterior cerarii each with smaller cerarian setae, 8–12 trilocular pores and 2–4 auxiliary setae. Frontal cerarius (C 1) with 2 conical setae, 0 or 1 auxiliary seta, and 8 or 9 trilocular pores; preocular (C 2) and ocular cerarii (C 3) absent. Circulus present, not large. Ostioles well developed. Anal ring with 2 rows of pores and 6 setae.

Dorsum with setae of various sizes but mostly short and slender. Multilocular pores absent. Trilocular pores evenly distributed. Oral collar tubular ducts of 2 sizes: larger type numerous on all segments, smaller type sparsely present on posterior abdominal segments.

Venter with normal flagellate setae. Multilocular disc pores present on posterior abdominal segments, with 2 or 3 rows on each posterior edge of segments VI and VII, and single rows on anterior edges of these segments, not reaching to margins; present also posterior to vulva; about 1 pore present on segment V; multilocular pores absent from thorax and head. Trilocular pores evenly distributed. Oral collar tubular ducts of same sizes as those on dorsum: larger type on abdominal segment III and posterior segments, and numerous on margins of posterior abdominal segments; smaller ducts forming marginal groups and sparsely present in median areas of posterior segments, present also on thorax and head .

Distribution: Dysmicoccus walkeri has been recorded from 17 countries in the Palaearctic Region including Iran ( García Morales et al. 2016), where it is known from Mazandaran province.

Host-plants: The species has been recorded on host-plants in 22 genera belonging to 4 families ( García Morales et al. 2016); in Iran, it has been found on Poaceae .

Economic importance: None.

Natural enemies: Not recorded in Iran.

Comments: Dysmicoccus walkeri is recorded here from Iran for the first time.

Figures

FIGURE 16. Adult female of Dysmicoccus walkeri (Newstead).

FIGURE 67. Maps of species distributions in Iran.A. Dysmicoccus brevipes (Cockerell); B. Dysmicoccus caspianensis Moghaddam; C. Dysmicoccus walkeri (Newstead); D. Dysmicoccus zagrosicus Moghaddam; E. Erimococcus kimmericus (Kiritshenko); F. Erimococcus talhouki (Matile-Ferrero); G. Eurycoccus tamariscus Williams; H. Exallomochlus balouchestanensis Moghaddam; I. Ferrisia virgata (Cockerell); J. Formicococcus robustus (Ezzat & McConnell); K. Kiritshenkella sacchari (Green); L. Maconellicoccus hirsutus (Green).