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International Journal of Agricultural Research
  Year: 2007 | Volume: 2 | Issue: 2 | Page No.: 102-114
DOI: 10.3923/ijar.2007.102.114
 
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Adverse Effects of Insecticidal Sprays on Bloom Onset, Pollen Germination and Fruit Set of Three Olive Cultivars
H. Mehri , R. Mehri-Kamoun , A. Ben Dhiab and M. El Mahjoub

Abstract:
Effects of three insecticides (Dimethoate (Dimate), Deltamethrine (Decis) and Oleoparathion (Oleokriss)) and a bioinsecticide (bactospeine) were compared over three olive cultivars Meski, Gerboui (local) and Coratina (introduced) to determine if insecticide treatment during bloom had an effect on olive productivity. Treatments were applied to field-grown trees during green-cluster stage and their effects were assessed by comparing pollen viability, germination and tube growth, bloom onset and fruit set efficiencies. After spraying, pollen was collected and germinated on insecticide-free media. Individual performance of the three cultivars is illustrated in this study. Generally, all olive cultivars showed similar trends with low pollen germination and tube growth, low fruit set and shortening of flowering period in presence of Oleoparathion and increasing to high levels in presence of Bactopeine. Oleoparathion treatments retarded germination, ruptured pollen tubes and damaged stigmatic surfaces in vivo. Germination and tube length were reduced when Dimethoate, Deltamethrine and Oleoparathion at 100% RFR were applied to pollen insecticide-free media. In contrast, at 10 and 1% RFR, these insecticides were less inhibitory and showed no difference from the control. Increased germination percentages and enhanced tube elongation were obtained when Bactospeine was sprayed to trees at 100, 10 and 1% RFR and for all the olive cultivars studied. It increases germination and tube length and has been partially effective in increasing mean fruit set and in shortening fruit development period. Flowering has been delayed for up to five days. Bactospeine sprays increased the extent and earliness of flowering period with increased Bactospeine spray concentration. It advanced blooming by 4-6 days according to cultivar while Oleoparathion shortened it. Bactospeine sprays also resulted in greater fruit set and fruit fresh weights and in earlier fruit ripening compared to the controls.
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How to cite this article:

H. Mehri , R. Mehri-Kamoun , A. Ben Dhiab and M. El Mahjoub , 2007. Adverse Effects of Insecticidal Sprays on Bloom Onset, Pollen Germination and Fruit Set of Three Olive Cultivars . International Journal of Agricultural Research, 2: 102-114.

DOI: 10.3923/ijar.2007.102.114

URL: https://scialert.net/abstract/?doi=ijar.2007.102.114

 
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