Galerucella placida
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Infraorder: Cucujiformia
Family: Chrysomelidae
Genus: Galerucella
Species:
G. placida
Binomial name
Galerucella placida
Baly, 1878
Synonyms
  • Adimonia mastersi Blackburn

Galerucella placida, is a species of leaf beetle found in South Asia, Southeast Asia and Australia.[1] It is widely used as a bio-control agent in many rice and wheat fields to control weeds.[2][3][4]

Description

Adult female is larger than male. Adult male is about 5.60 mm in length whereas adult female is 6.25 mm in length. Total life cycle of the beetle ranges from 21 days.

Eggs are bright yellow, with pyriform basally rounded and oval tip. Length of an egg is about 0.67 mm. The incubation period is about 3 days. There are three larval stages. First instar is yellowish and 1.26 mm in length. Initially second instar is also yellowish, but turn to blackish brown after an hour of feeding. Total length of second instar is about 2.64 mm. The third and final instar is about 5.59 mm in length and blackish brown. Total larval duration is about 13 days. Pupa is black and 4.58 mm in length.

Biology

Adult beetles are often used as biocontrol agents on the many invasive weeds such as Rumex dentatus, Polygonum glabrum and Polygonum orientale.[5][6][7] Adults are also attracted to the leaves of the weed, Polygonum orientale.[8]

It also feeds on aquatic weed Polygonum hydropiper. Adults feed by scraping the green tissues from the leaves. With infestation, remaining tissue also falls by producing a hole. Heavy infestation can cause all leaf tissue to removed with holes. Larval stages also scrap the green tissue to lower epidermis which produces holes of irregular shape. Heavy infestations with grubs lead leaves to dried up and become brownish.

References

  1. ↑ Reid, Chris AM (2001). "Galerucella placida Baly in Australia (Coleoptera: Chrysomelidae: Galerucinae)". Australian Journal of Entomology. 40 (4): 331–334. doi:10.1046/j.1440-6055.2001.00245.x. Retrieved 2021-09-29.
  2. ↑ Malik, Ujjwal; Das, Swati; Barik, Anandamay (2018-09-01). "Biology of Galerucella placida Baly (Coleoptera: Chrysomelidae) on the Rice-Field Weed Polygonum orientale L. (Polygonaceae)". Proceedings of the Zoological Society. 71 (3): 257–264. doi:10.1007/s12595-016-0203-x. S2CID 2449911. Retrieved 2021-09-29.
  3. ↑ Koner, Anamika; Das, Swati; Mobarak, Syed Husne; Barik, Anandamay (n.d.). "Short-range attraction and oviposition stimulant of a biocontrol agent, Galerucella placida Baly (Coleoptera: Chrysomelidae) toward weed leaf surface waxes". Bulletin of Entomological Research (published 27 August 2021). 112 (2): 204–218. doi:10.1017/S0007485321000730. PMID 34448446. S2CID 237321293. Retrieved 2021-09-29.
  4. ↑ "Attraction of the biocontrol agent, Galerucella placida Baly (Coleoptera: Chrysomelidae) to the leaf surface alkanes of the weed, Polygonum orientale L." www.cabdirect.org. Retrieved 2021-09-29.
  5. ↑ Koner, Anamika; Debnath, Rahul; Barik, Anandamay (2019-12-01). "Age-stage, two-sex life table and food utilization efficiencies of Galerucella placida Baly (Coleoptera: Chrysomelidae) on two Polygonaceae weeds". Journal of Asia-Pacific Entomology. 22 (4): 1136–1144. doi:10.1016/j.aspen.2019.10.001. S2CID 208600575. Retrieved 2021-09-29.
  6. ↑ Das, Swati; Malik, Ujjwal; Barik, Anandamay (December 2018). "Effect of thermal stress on antioxidant responses of the biocontrol agent Galerucella placida (Coleoptera: Chrysomelidae)". International Journal of Tropical Insect Science. 38 (4): 400–409. doi:10.1017/S1742758418000218. S2CID 92159620. Retrieved 2021-09-29.
  7. ↑ Malik, Ujjwal; Karmakar, Amarnath; Barik, Anandamay (2016-04-01). "Attraction of the potential biocontrol agent Galerucella placida (Coleoptera: Chrysomelidae) to the volatiles of Polygonum orientale (Polygonaceae) weed leaves". Chemoecology. 26 (2): 45–58. doi:10.1007/s00049-015-0206-5. S2CID 18558644. Retrieved 2021-09-29.
  8. ↑ Malik, Ujjwal; Barik, Anandamay (2015-05-04). "Free fatty acids from the weed, Polygonum orientale leaves for attraction of the potential biocontrol agent, Galerucella placida (Coleoptera: Chrysomelidae)". Biocontrol Science and Technology. 25 (5): 593–607. doi:10.1080/09583157.2014.1000264. S2CID 84579768. Retrieved 2021-09-29.


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