07.04.2013 Views

Biological Control of Insect Pests: Southeast Asian Prospects - EcoPort

Biological Control of Insect Pests: Southeast Asian Prospects - EcoPort

Biological Control of Insect Pests: Southeast Asian Prospects - EcoPort

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

4.7 Diaphorina citri<br />

India<br />

20°<br />

Myanmar<br />

P Laos<br />

0°<br />

20°<br />

China<br />

++<br />

Thailand<br />

P<br />

Cambodia<br />

Vietnam<br />

++<br />

+ Brunei<br />

Malaysia<br />

+<br />

Singapore<br />

++<br />

Indonesia<br />

Taiwan<br />

+++<br />

++<br />

Philippines<br />

Australia<br />

+<br />

Papua<br />

New Guinea<br />

113<br />

The citrus psyllid Diaphorina citri is native to the Indo-Malaysian region, but has spread<br />

outside it to RŽunion, Mauritius, Saudi Arabia, Honduras, and Brazil. The sap it removes<br />

from new flushes <strong>of</strong> citrus growth is <strong>of</strong> minor consequence, but it is the vector <strong>of</strong> a<br />

devastating bacterial disease, citrus greening.<br />

Its major controlling factors are high rainfall (washing <strong>of</strong>f eggs and young nymphs) and<br />

two parasitoids, Tamarixia radiata and Diaphorencyrtus aligarhensis.<br />

Where these<br />

parasitoids are native they are very heavily attacked by hyperparasitoids which diminish<br />

their effectiveness. Freed <strong>of</strong> these hyperparasitoids T. radiata has been established in 3<br />

countries where it was not present: RŽunion, Madagascar and Taiwan, resulting in<br />

excellent biological control. Although T. radiata appears to be widespread in <strong>Southeast</strong><br />

Asia, observations might well disclose regions where it is not present and could be<br />

introduced with advantage. The prospects for successful biological control <strong>of</strong> D. citri are<br />

good when it invades regions where hyperparasitoids <strong>of</strong> T. radiata are absent or deficient.<br />

20°<br />

0°<br />

20°

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!