Study on lady bird (Chilocorus bipustulatus) feeding from Aonidiella orientalis and susceptibility to volk oil
2010
Rangbar, S, Agricultural Research Departement of Jiroft & Kahnoj
Despite of wide usage of oils to control of Aonidiella orientalis in jiroft,There isnt any record about their side effects on natural enemies especially Chilocorus bipustulatus. This research was conducted in 85-87 years and in two phases, In the first stage to determine feed rate of ladybird per day three adult male and female ladybird and three 3 instar larvae that dont feed for 4 hours were put on citrus leaves. There are 30 Aonidiella orientalis in every leaf. After 24 hours dead and live pest were counted. In the second stage, glass plates (20×20 cm) with a 12 cm diameter polyethylene in the center, were used. Four treatments were: 3 different concentration 0.5, 1 and 1.5% of volk oil and water. Then 10 1st instar larvae and 10 adult ladybird were transferred to glass plate and second glass plate was put on it and different treatments were spraied to them. Results showed that, male, female and 3 instar larvae of lady bird feed about 6.15±0.3, 6.37±0.28 and 7.09±0.11 of host respectively. Which are noticeable to control of pest. In second stage results revealed that oil with 0.5, 1 and 1.5% concentration effected 25, 37.5 and 62.5 of 1 instar larvae of lady bird respectively and so 1 and 1.5% concentration put in slightly harm group (group2) and 0.5%concentration harmless group (group1). Oil with 0.5,1 and 1.5 % concentrations effected 22.5, 30 and 57.5 respectively, against lady bird adults, and so 1 and 1.5% concentrations arranged in group 2(slightly harm) and 0.5% in group 1(harmless).On the basis of this study it can be concluded, that the usage of Volk oil is almost to both environment and natural enemies and also 0.5% is the safest concentration.
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