oa Journal of the Entomological Society of Southern Africa - The effect of Abate and Delnav on populations of red scale, Aonidiella aurantii (Mask.). in citrus orchards under integrated control



Two sprays of Abate or Delnav for the control of Scirtothrips aurantii Faure on citrus trees were shown to cause heavy infestations of Aonidiella aurantii (Mask.) in orchards already under integrated control. Some of the control plots appeared to be affected by the surrounding treatments. An additional three sprays proved conclusively that Abate and Delnav could seriously disrupt the biological control of red scale. The effects of Abate were generally two or more times as severe as those caused by Delnav, while Abate caused a correspondingly greater reduction of parasitism of red scale by Aphytis africanus Quednau.


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