Investigation on the predatory efficacy of important predatory species Pulvinaria aurantii Cockerell on the 2nd instar nymph
2010
Khazaeipool, A. | Fathi, A. A. | Davari, M. | Aghajanzadeh, S.
Pulvinaria aurantii Cockerell is one of the most important pests of citrus gardens that cause serious damage to these trees. Cryptolaemus montrouzieri Mulsantˬ Chilocorus bipustulatus L. and Chrysopa carnea Stephens are important natural enemies of this pest. This experiment was assessed in an incubator that was set at 22±1oC, 70±5% RH and 14:10h (L:D) photoperiod. In this way, Plexiglas containers, 2l size, contained of two leaves of sweet orange with 40 the 2nd instar nymph of P. aurantii was used. One female of C. montrouzieriˬ one female of Ch. bipustulatus and one latest instar larvae of Ch. carnea that was starved for 24h, were released inside the each Plexiglas containers in separated releases and in combined releases. These experiments were conducted with 6 treatments each with 10 replication in a completely randomized design for 24h. Number of consumed the 2nd instar nymph were recorded. The data were analyzed with SAS software in SNK method. Number of consumed the 2nd instar nymph in separated releases and in combined releases shown significantly different (P0.01). The average comparison shown that in separated releases of each predator species, the latest instar larvae of C. carnea was consumed the highest 2nd instar nymph of P. aurantii in compare to C. montrouzieri and C. bipustulatus. In combined releases of predator species, the highest 2nd instar nymph of P. aurantii were consumed by release of one female of C. montrouzieri + one latest instar larvae of C. carnea. These results indicated that effect of the combined releases of predator species is more than separated releases of each predator species.
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