8. Conducting pollination research in greenhouses and tunnels
Many high-value cash crops which were once cultivated exclusively in open fields are now grown in greenhouses and net-houses. This shift has been made mainly to protect plants from pests, enable out-of-season production, isolate plants for production of pure seeds, or to limit other environmental hazards (Fig. 17).
Assessing pollination activity in an enclosure is similar to assessing it in the open field (see sections 4 and 5). However, conducting pollination research in this specialized environment requires special considerations, covered below.
Fig. 17. Bee hive placed for greenhouse melon pollination