PEST RISK ANALYSIS (PRA) TRAINING Group Exercises Manual

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APPENDIX 8 PEST RISK ANALYSIS TRAINING - GROUP EXERCISES MANUAL Grove et al.: Thrips species associated with mango trees in South Africa 159 Figs 1-3. Numbers and species of thrips recorded from yellow card traps in mango orchards. Horizontal lines indicate the phenology of flowering and fruiting. 1, Numbers of Scirtothrips aurantii and Thrips tenellus recorded from yellow card traps in a Sensation orchard at Nelspruit during 1992-1993; 2, numbers of S. aurantii and T. tenellus recorded from yellow card traps in a Zill orchard at Friedenheim during 1992; 3, numbers of S. aurantii and T. tenellus unrecorded from yellow card traps in a Fascell orchard at Friedenheim during 1992. 86
PEST RISK ANALYSIS TRAINING - GROUP EXERCISES MANUAL APPENDIX 8 160 African Entomology Vol. 9, No. 2, 2001 Figs 4-5. Numbers and species of thrips recorded from yellow card traps in mango orchards. Horizontal lines indicate the phenology of flowering and fruiting. 4, Numbers of Scirtothrips aurantii, Thrips acaciae and Thrips tenellus recorded from yellow card traps in a Zill orchard at Friedenheim during 1996; 5, numbers of S. aurantii, T. acaciae and T. tenellus recorded from yellow card traps in a Sensation orchard at Friedenheim during 1996. numbers of S. aurantii were present during both flowering and fruit set. Scirtothrips aurantii, T. acaciae or T. tenellus were the most abundant species in the flowers. However, abundance of thrips species in the flowers varied seasonally and between orchards. Monitoring thrips with DIE traps The D/E traps yielded similar abundance patterns to yellow card traps, with high numbers of T. tenellus and T. acaciae present during the flowering period which declined when fruit were setting and developing (Figs 6, 7). However, in the Zill orchard, thrips numbers peaked about three weeks earlier on the card traps than on the D/E traps. Very low numbers of S. aurantii were present during the flowering period and when fruit were small. Scirtothrips aurantii was the most widely distributed species in the survey when considering results from flowers, leaves and fruit. It was also one of only two species found to cause lesions on the fruit. Although S. rubrocinctus caused fruit damage, it was much less abundant than S. aurantii and did not seem to be of economic importance. When using both trapping techniques, S. aurantii was the second most abundant thrips during flowering and the most abundant after flowering. Based on these observations, S. aurantii is considered to be the most economically important thrips species on mangoes in South Africa. 87
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Table of Contents Acknowledgements.
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FOREWORD Welcome to the IPPC introd
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GROUP EXERCISE NO. 1 PEST RISK ANAL
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PEST RISK ANALYSIS (PRA) TRAINING Group Exercises Manual

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