Insecticide Effect of Sucrose Fatty Acid Esters on Calacarus heveae
Feres (Acari: Eriophyidae) in two rubber tree clones
Rodrigo D. Daud, Reinaldo J.F. Feres &
Maurício Boscolo
Abstract
Sucrose esters are biodegradable, non pollutant and safe for health;
moreover, they have shown great potential in the pest control. We
tested a crude mix of sucrose esters on the survivorship and
oviposition of Calacarus heveae Feres (Acari: Eriophyidae) females, an
important rubber tree pest mite. The females were collected from rubber
leaflets of the GT 1 and
RRIM 600 clones. The mites were kept on stock arenas placed in rearing
chamber at 28 + 0,1°C, 80 + 10% of relative humidity and 12h of
light phase about two weeks before the assays. After this period, the
mites were transferred to assay arenas made with leaflets from the same
clone of stock arenas.
The survivorship of females sprayed with sucrose esters in the
concentrations of 1, 2, 3 and 4 g/L and their oviposition effect with
0.5 and 1 g/L were analyzed. The mites sprayed with 4 g/L had about 80%
of mortality, while those with 1 g/L around 60%. All mites that died in
the treatments with sucrose
ester became dark with wrinkled tegument and decreased their body
volume, suggesting dehydration. We also observed the efficacy of 1 g/L
concentration to decrease the female oviposition in about 50%, in the
third day after spraying.
No differences were observed in the mortality and oviposition between
females kept on both clones.
Key
words
- Biopesticide, Euphorbiaceae, Hevea brasiliensis,
Integrated Pest Management.
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