sodininkystė ir daržininkystė 25(4)

population result in greater resistance (Devine et al., 2001; Elzen, Hardee, 2003; Van
Leeuwen et al., 2005). Therefore, the European guidelines for integrated fruit production
require restrictions in pesticide use (Dickler, Schaefermeyer, 1991). The
reduction of the use of pesticides stimulates to look for the development of new plan
protection products. The Integrated pest management (IPM), which is based on
selective toxicity to the phytophagous mites and harmless to predatory mite, became
the most relevant strategy of plant protection (Edland, 1994; Leake, 2000; Linquist,
2000; Klassen, 2000).
The aim of the work was to clarify how Abamectin, which is based on selective
toxicity, affects fruit tree red spider mite in apple trees.
Materials and methods. The field trials were carried out in the apple tree orchard
of the Lithuanian Institute of Horticulture in 2005–2006. The apple trees (variety
‘Lobo’) were planted in 1995. 1 250 seedlings per hectare were planted. The soil was
fertilized with N – 70 kg ha -1 before flowering. Efector 700 WG 1.0 kg ha -1 at 09, 57
and 73 growth stages was treated for control of apple scab.
The trial was carried out according to trial plan as presented in Table 1.
Treatment
Variantas
Table 1. Trial plan
1 lentelë. Bandymo planas
Trade name
Preparato registracijos
pavadinimas
A Rate (g AI ha -1 )
Norma, g v.m. ha -1
-
Untreated / kontrolë (nepurkšta)
Abamectin 18 g l -1
Abamectin 18 g l -1
Abamectin 18 g l -1
Lambdacihalotrin 50 g l -1
Spirodiclofen 240 g l -1 Vertimec EC 18 g l -1
Vertimec EC 18 g l -1
Vertimec EC 18 g l -1
Karate EC 50 g l -1
Envidor SC 240 g l -1 27
18
13.5
25
96
A
AI – active ingredient / veiklioji medþiaga.
Plot size at least 5 trees, 4 replications at random plot distribution. Motor sprayer
STIHL SR400 was used for spraying, water volume – 500 l ha -1 . Weather conditions
at 73 growth stage according BBCH scale (Meier, 1997) during application
presented in Table 2.
Assessments in 2005 and 2006 were made as follows: before application (VII.13
and VII.12), 2–5 (VII.18 and VII.14), 7 (VII.23 and VII.21) and 31 day (VIII.15
and VIII.14) after application. Assessments were made on 25 leaves for assessment
the number of fruit tree red spider mites per leaf in each plot.
Meteorological data (air temperature and amount of precipitation) were recorded
using scab warning equipment Metos D (Table 3).
163