Plusia semi-looper
Namibian crop pests  #  109

unknown Order: Lepidoptera Family: 


Two specimens of Plusia semi-loopers hatched from samples of bambara groundnut leaves collected at Mahenene Research Station, Omusati region on 27 March 2002. One Plusia semi-looper species (Chrysodeixis acuta) is recognised in South Africa as a pest of tomato and other crops and has also been recorded in Namibia (1928) (NHM, London). The semi-looper species, however, are very similar and a proper identification is therefore needed.
 

Young cocoon on bambaranut leaf
(Photo: W. Schenkel)

Young cocoon on bambaranut leaf
(Photo: W. Schenkel)

Moth (37 mm)

 

Common names: 

No vernacular names were recorded

Pest status:

The pest status is not established. Plusia semi-looper adults are ocassionally seen at lights in Northern Namibia.
The caterpillars are found on bambaranut plants

Distribution:

This species has only been noted (and looked for) at Mahenene Research Station, Omusati region on 26 March 2002.

Description:

Attacks leaves of bambara groundnuts (Vigna subterranea) and possibly other vegetable crops. Leaves are spun together two and two to cover the caterpillar. The affected leaf area turns silvery or pale grey. The caterpillars move with a typical looping and measuring action. They are 25-30 mm long, green with green stripes along the body. 
(Description is based on literature as the caterpillars were not found in the sample) 

The young pupae are pale green and attached in a loose cocoon to the leaf. The pupae is 20 mm long.

The adult moth has a wing span 37 mm.
 

Control:

No control is advised until the pest status is determined.

Other notes:

Thanks to Werner Schenkel and Teresia Kaulihova for taking photos and bringing in more samples of the two moths that are mining on Bambaranut leaves.

Chrysodeixis acuta is "pest of the month" at CABI which shows a comprehensive distribution list for this species. The page is difficult to find but try to search for the species on the search engines. 



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