Polinização e frutificação da pereira ‘Rocha’ em Vacaria, RS, Brasil

Vegetative growth and productive performance of 'Abate Fetel' and 'Rocha' pear trees on quince rootstocks

“…The low fructification of ' Abate Fetel' is possibly a consequence of a lack of flowering synchrony with other cultivars, implicating in a lower pollen availability for cross-pollination. This cultivar had an earlier flowering period than the others and only showed synchrony with 'Forelle', which, in most years, presented a low flowering intensity (North et al, 2015), whereas, in the experimental conditions of the present study, 'Rocha' showed a moderate flowering synchrony with 'Packham's Triumph' (Luz et al, 2017). Therefore, the low fructification found for 'Rocha' in some years is possibly related to the low flowering intensity of 'Packham's Triumph' when used as a pollinator, which may be due to the high rate of flower abortion observed in some years and to deficiencies in pollination due to unfavorable climatic conditions during the flowering period (Luz et al, 2017).…”

“…The authors concluded that around 80% of the fruits were formed by self-pollination or parthenocarpy, which caused a low fructification and a yield of only 11 Mg ha -1 . However, the manual pollination of 'Rocha' led to an increase in effective fructification and, consequently, increased yield to 66.7 and 72.9 Mg ha -1 , when 'Packham's Triumph' and Pyrus calleryana L. pollen were applied, respectively (Luz et al, 2017). Therefore, the low effective fructification observed for 'Rocha' and ' Abate Fetel' pear trees in the present work may be a consequence of pollination issues.…”

“…Pollination problems were reported by Luz et al (2017) in a 'Rocha' commercial orchard, also in the conditions of the municipality of Vacaria. The authors concluded that around 80% of the fruits were formed by self-pollination or parthenocarpy, which caused a low fructification and a yield of only 11 Mg ha -1 .…”

“…These results show the importance of the choice of pollinator cultivars and the position of the plants in the orchard. It is recommended installing more than one pollinator cultivar, which must have flowering synchrony and gametophytic compatibility with the producing cultivar plants (Souza & Calouro, 2014;Luz et al, 2017). Regarding the pollinator plant positions, the greater the distance for pollination, the lower fructification tends to be.…”

“…tree crops in Southern Brazil. This low yield is attributed to a low fructification rate, related to aspects that influence pollination (Hawerroth & Petri, 2011;Luz et al, 2017), such as the cultivars used in different planting regions (Rufato et al, 2012) and the excessive vegetative growth of plants due to the use of vigorous rootstocks and to climatic conditions favorable for a longer growth period (Hawerroth & Petri, 2011;Rufato et al, 2012;Pasa et al, 2017).…”