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High populations of S. sacchari are associated with poor growth and yellowing of the stem and leaves. Copious honeydew often attracts ants. High populations and thus high levels of honeydew can also give rise to sooty mould production.
S. sacchari usually causes insufficient direct damage to necessitate control measures. However, control may be important because of the mealybug's association with sugar quality and for virus 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:
S. sacchari rarely causes yield loss in sugarcane, but high populations can
weaken sugarcane plants and symptoms such as stunting and yellowing, death of
young shoots and impaired growth are recorded (Dick, 1969). Field studies in
Uttar Pradesh (Atiqui and Murad, 1992) indicated that infestation of the
cultivar Co1148 decreased the sucrose and sugar content of sugarcane and its
purity (average losses in brix, pol, purity and available sugar content of
10.64, 16.44, 6.14 and 12.92%, respectively). However, the volume of cane juice
was not affected significantly.
High populations can produce large amounts of honeydew and sooty mould growing on this excreta will disfigure crops. S. sacchari is associated with filtration and clarification problems, lower quality of the syrup and reduced crystallization (Hall, 1922; Dymond, 1929; Dick, 1969). These effects are probably related to the production of honeydew and associated polysaccharides and gums and/or the close association with S. sacchari of acetic-acid-producing bacteria (Ashbolt and Inkerman, 1990).
S. sacchari is a vector of sugarcane mosaic potyvirus (SCMV) (Lockhart et al., 1992).