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Plantwise Technical Factsheet

pear and cherry slugworm (Caliroa cerasi)

Host plants / species affected
Amelanchier (serviceberries)
Cotoneaster
Crataegus crus-galli (Cockspur hawthorn)
Crataegus monogyna (hawthorn)
Cydonia oblonga (quince)
Malus domestica (apple)
Mespilus germanica (medlar)
Prunus armeniaca (apricot)
Prunus avium (sweet cherry)
Prunus domestica (plum)
Prunus dulcis (almond)
Prunus salicina (Japanese plum)
Prunus serotina (black cherry)
Pyracantha (Firethorn)
Pyrus communis (European pear)
Rosa (roses)
Rubus idaeus (raspberry)
Salix (willows)
Sorbus aucuparia (mountain ash)
List of symptoms/signs
Fruit  -  premature drop
Leaves  -  abnormal colours
Leaves  -  abnormal forms
Leaves  -  abnormal leaf fall
Leaves  -  abnormal patterns
Leaves  -  external feeding
Leaves  -  leaves rolled or folded
Whole plant  -  dwarfing
Symptoms
Blistering, skeletonisation and discoloration of leaves, leaving only one layer of epidermis intact, inward curling and premature shedding of leaves and fall of fruit, retarded development of plant/tree (Miles, 1935; Avidov and Harpatz, 1969).
Prevention and control
Biological control

Biological control was first attempted in New Zealand in 1923-24 when Lathrolestes luteolator was imported from the UK and released in small numbers. It was again imported in 1929-30. When a further importation of parasitoids was made in 1972-74, it was found that L. luteolator had become established in the Nelson area from the earlier releases but was ineffective. Rhinotorus congruens and Synomelis sp. were also released at this time but it is not known if they became established. However, it was also discovered that a large proportion of larvae in this area were infected with the protozoan disease Blastocrithidea caliroae. The distribution and impact of this disease were not known and surveys to determine this and the impact of L. luteolator were recommended (Cameron et al., 1989).

In Lithuania, some control of eggs and larvae of C. cerasi (ca 5.4-7.7%) was afforded by Anthocoris nemorum (Zayanchkauskas and Rilishkene, 1979).

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:

Impact
C. cerasi is a worldwide pest, appearing each year in cherry (and other orchards) and in urban environments and one which requires annual treatment (MAFF, 1972; Hely et al., 1982; Agriculture Canada, 1983). Between 30-100% of the leaves of cherry in the Zaporozh region of Russia were infested in 1972-76 (Chepurnaya and Myalova, 1981).
Related treatment support
 
External factsheets
BBC Pest and Disease Factsheets, British Broadcasting Corporation (BBC), English language
British Columbia Ministry of Agriculture Factsheets, Government of British Columbia, 2010, English language
University of California IPM Pest Management Guidelines, University of California, 2009, English language
University of California IPM Pest Management Guidelines, University of California, 2012, English language
Ontario CropIPM factsheets, Ontario Ministry of Agriculture, Food and Rural Affairs, Canada, 2015, English language
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