Presence of pollinators in young palms of the OxG Amazon and bunch conformation
Adult Elaeidobius kamerunicus and Mystrups costarricenses were present on male and female inflorescences of the OxG Amazon hybrid in Cukra, on the Atlantic coast of Nicaragua. More importantly, it was found that E. kamerunicus is capable of reproducing in the male inflorescences of this hybrid developed by ASD, as an alternative for areas afflicted by spear rots on Elaeis guineensis in tropical America.
Other information of interest for the grower of this new hybrid is that the percentage of fertile fruits on the bunch presents a clear tendency to increase as agronomic management is improved (improvements in drainage, fertilization, weed control, etc.), which obviously is accompanied by better productivity.
Elaeidobius kamerunicus on a male inflorescences of the OxG Amazon hybrid
E. kamerunicus larvae obtained from a male Amazon spike (post - anthesis)
Sticky trap placed on a female inflorescence showing the visits of pollinators on the OxG Amazon hybrid and an Elaeis guineensis plant (where there were more visits)
Although bunch conformation (fruit set: fertile fruits among the total fruits on the inflorescence) was usually low in this two-year-old plantation (16.3%), no rotten inflorescences (bunch failure) were found that could be associated with poor pollination.
The maturation of the bunches (in the absence of assisted pollination) is probably due to the high proportion of parthenocarpic fruits (usually above 90%). The persistence of the parthenocarpic fruits (where the development of the embryo can be interrupted later) could occur as an initial stimulus for the arrival of pollen, possibly from nearby plantings of E. guineensis. The maturation of the bunches in the absence of assisted pollination does not occur in other traditional OxG hybrids and the bunches fail early.