The field experiments were carried out in two consecutive years (2005-2006) at Kruszyn Krajeński near Bydgoszcz. The aim of the study was the influence of different systems of irrigation in asparagus hybrids cultivation on the very light soil on the occurrence of asparagus beetles. The experiments were conducted in a randomized block design of a two-factorial system with four replications. The first tested factor was irrigation in three following variants: O - non-irrigated plots (control), K - drip-irrigated plots and M - micro-irrigated plots. The second factor was associated with two asparagus hybrids (called by producer): Ap, Gr and one cultivar ‘Schwetzinger Meisterschuss'. The number of adults and larvae of both asparagus beetles was observed on every single plot area; three times during the vegetation period from July to August (beginning from the first decade of July and continuing every third week). The harvest plot area was 14.5 m2 (23 plants x 35 cm x 180 cm). Generally, the adults and larvae of twelve-spotted asparagus beetles were more numerous than common asparagus beetles on aspa-ragus hybrids plants: Ap, Gr and ‘Schwetzinger Meisterschuss'. Microirrigation applied on asparagus hybrids wasn't related with these two asparagus beetles did not susceptible to. Much the ...
Asparagus infection with numerous pathogens very often decreases yield of spears. Efficient protection of asparagus plantation can be very difficult and sometimes even unavailable due to lack of effective plant protection agents to control of some pathogens. The choose of cultivar and field before the establishment of plantation are crucial in such cases. Irrigation has also a very considerable impact on asparagus yielding. It can influenced the diseases development too. The aim of the research was to evaluate the susceptibility of microirrigated, three German asparagus cultivars to the plants infection by pathogens.The field experiment was settled in 1998 at KruszynKrajenski near Bydgoszcz on a sandy soil. The first factor was microirrigation used in variants: W1 - non-irrigated plots (control), W2 - drip-irrigated plots, W3 - microsprinkler-irrigated plots. Irrigation doses were adequate for amount and distribution of rain-precipitation and were found out by tensiometers, too. They amounted to 195 and 113 mm for micro-sprinkler and drip irrigation, respectively. The second factor were three German cultivars of asparagus: ‘Ap', ‘Gr' and ‘SchwetzigerMeisterschuss', grown for blanched spears. Plant healthiness observations were carried out in the first 4 harvest years (2000-2004). Occurrence of root and stem rot (Fusariumoxysporumf.sp. asparagi, F. culmorum), asparagus rust ...
