Abstract
One of the most important pests which affects the olive orchards in the Azapa
valley is the citrus nematode Tylenchulus semipenetrans Cobb. The main objective of
this study was to evaluate the effect to compounds of biologic origin on the populations
of T. semipenetrans Cobb in an olive orchard (Olea europaea). The experiment was
carried out in an olive orchard in the Azapa valley, Arica, Parinacota region, Chile. For
the experimental design four complete randomized blocks were used. There were five
treatments and one untreated control, with four replications: Manure (T1), Micosplag
WP (T2), QL Agri
®
35 (T3), DiTera
®
WG (T4), Nemacur
®
240 CS (T5) and untreated
control (T0). We evaluated the populations of the mobile second stage (J2) and adult
females of T. semipenetrans at 120 days after application of treatments. The effectiveness
of treatments was determined using the Abbott formula ((living individuals in the
control - living individuals in the treatment)/ living individuals in the control) × 100)
and the Oostenbrink reproduction factor (R) which uses initial (Pi) and final (Pf)
populations (R = Pf/Pi) to estimate reproductive capabilities of nematodes. Data were
analyzed using ANOVA and the Duncan test (p≤0.01) was used for significant
differences between treatments. The evaluations demonstrated that applications of
biological products and manure can control the citrus nematode, and DiTera
WG was
as effective (p