EFFECTS OF A ROTATION OF SIMAZINE, TERBACIL, AND DICHLOBENIL IN A MATURE APPLE ORCHARD

1981 ◽  
Vol 61 (2) ◽  
pp. 407-411 ◽  
Author(s):  
H. B. HEENEY ◽  
V. WARREN ◽  
S. U. KHAN
Keyword(s):  
Weed Control ◽  
Apple Orchard ◽  
Common Vetch ◽  
Apple Trees ◽  
Tert Butyl ◽  
Nutrient Levels ◽  
Control Growth ◽  
Vicia Cracca ◽  
Mature Apple

Annual yields of mature Kinkead Red Spy apple trees were higher when growth under trees was controlled by a rotation of three herbicides, namely, simazine (2-chloro-4, 6 bis(ethylamino)-s-triazine), terbacil (3-tert-butyl-5-chloro-6-methyluracil) and dichlobenil (2,6-dichlorobenzonitrile) compared to yields of trees in which sod was regularly mowed to control growth of weeds. While weed control with herbicide rotations was not as effective as with continuous usage of a single herbicide, it was commercially acceptable, and the problem of common vetch (Vicia cracca L.) as on escape weed, particularly with continuous simazine was largely avoided. Over the 6-yr period there was little effect on nutrient levels of the foliage. Use of a rotation of herbicides prevented the accumulation of residues in the soil and levels of all herbicides noted in year 1 of the rotation were reduced to negligible amounts 2 yr after a particular herbicide had been applied.

EFFECTS OF ANNUAL REPEAT APPLICATIONS OF SIMAZINE, DIURON, TERBACIL, AND DICHLOBENIL IN A MATURE APPLE ORCHARD

1981 ◽  
Vol 61 (2) ◽  
pp. 325-329 ◽  
Author(s):  
H. B. HEENEY ◽  
V. WARREN ◽  
S. U. KHAN
Keyword(s):  
Weed Control ◽  
Apple Orchard ◽  
Common Vetch ◽  
Apple Trees ◽  
Nitrogen Levels ◽  
Fruit Maturity ◽  
Herbicide Treatments ◽  
Continued Use ◽  
Vicia Cracca ◽  
Mature Apple

Annual tree growth and yields of mature Bancroft apple trees was higher when simazine (2-chloro-4,6 bis(ethylamino)-s-triazine), terbacil (3-tert-butyl-5-chloro-6-methyluracil) and dichlobenil (2-6-dichlorobenzonitrile) were applied annually for 6 yr to control weeds compared to trees that were regularly mowed. Fruit maturity was slightly delayed with herbicide treatment. While acceptable weed control was afforded by all herbicide treatments, repeat applications of terbacil annually gave the highest level of weed control. There was an indication after a number of years of simazine use that common vetch (Vicia cracca L.) would become a major problem. In these trials all herbicides accumulated in the 0- to 15-cm surface layer of the soil profile. Continued use of specific herbicides would have some effect on both potassium and magnesium in foliage collected in mid-July. Nitrogen levels in the leaves were not increased significantly during the study.

Soil water use from an apple orchard under various soil management systems

1970 ◽  
Vol 10 (43) ◽  
pp. 209 ◽  
Author(s):  
JDF Black ◽  
PD Mitchell
Keyword(s):  
Soil Moisture ◽  
Soil Management ◽  
Soil Surface ◽  
Field Capacity ◽  
Apple Orchard ◽  
Management Systems ◽  
Apple Trees ◽  
Weed Growth ◽  
Bare Land ◽  
Mature Apple

Commencing at field capacity, changes in soil moisture levels over fourteen-day drying periods were compared for mature apple trees under various soil management systems during spring and summer. In spring, the rate of loss under trees in a mown pasture was greater than under trees in cultivation or herbicide. In summer, the rate of loss under trees in uncontrolled summer weed growth after spring cultivation (trashy cultivation) was greater than under trees in mown pasture, clean cultivation or herbicide treatment, but the mown pasture did not differ from the bare land treatments. It is proposed that the influence of the tree on the microclimate at the soil surface is responsible for these effects. Differences in yield under the treatments were not statistically significant and there were no consistent differences in fruit growth rates over the whole season.

Influence of Application Method on the Activity of Butylate and EPTC in Reduced-Tillage Corn (Zea mays)

Weed Science ◽  
1987 ◽  
Vol 35 (3) ◽  
pp. 412-417 ◽  
Author(s):  
Douglas D. Buhler
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
The Other ◽  
Growth Chamber ◽  
Reduced Tillage ◽  
Corn Yield ◽  
Liquid Fertilizer ◽  
Application Method ◽  
Control Growth ◽  
Application Methods

Weed control in reduced-tillage corn (Zea maysL. ‘Pioneer 3732′) with butylate [S-ethyl bis(2-methylpropyl) carbamothioate] and EPTC (S-ethyl dipropyl carbarnothioate) was not reduced when these herbicides were applied jointly with dry or liquid fertilizer. In most cases, application with fertilizer resulted in weed control similar to that observed when the herbicide was applied in water at 285 L/ha. Butylate applied as a granular formulation also gave weed control similar to the spray at 285 L/ha. Application in 95 L/ha of water consistently resulted in reduced weed control. Corn injury was not greatly influenced by application method, and differences in corn yield appeared to be due to differences in weed control. Growth chamber bioassays indicated that both butylate and EPTC dissipated more rapidly when applied in 95 L/ha of water than the other application methods, which may explain differences in weed control observed in the field.

scholarly journals Effect of Different Growing Systems of Apple on Trunk and Branch Diseases and Pests

2012 ◽  
Vol 40 (2) ◽  
pp. 159 ◽  
Author(s):  
Maria BOROVINOVA ◽  
Vilina PETROVA ◽  
Svetla MANEVA
Keyword(s):  
Experimental Period ◽  
Apple Orchard ◽  
Mineral Fertilizers ◽  
Conventional System ◽  
Apple Trees ◽  
Pests And Diseases ◽  
Botryosphaeria Obtusa ◽  
Apple Production ◽  
The Mean ◽  
Important Disease

The presented study aimed to determine apples trunk and branch diseases and pests in three growing systems conventional, integrated and biological (organic). The investigations were made on an experimental apple orchard (1 ha) of the Institute of Agriculture at Kyustendil, Southwest Bulgaria in four consecutive years from 2007 to 2010. Three scab resistant cultivars Prima, Florina and Erwin Baur grafted on rootstocks MM106 were planted in 1996. The orchard was divided into four plots. One plot was treated conventionally with a normal pesticide programme, two plots were treated integrated according to the general principles, rules and standards of integrated apple production and one plot for biological (organic). The monitoring of pests and diseases and assessment of their density were done every two weeks. It was established that during the experimental period important disease and pests on apple trees in different growing systems were black rot Botryosphaeria obtusa, apple clearwig moth Synanthedon myopaeformis and shorthole borer Scolytus rugulosus. The damages by trunk and branch diseases and pests on apple were considerable higher in biological growing system. The mean rate of attack of cultivar Erwin Baur by Botryosphaeria obtusa in biological and conventional growing systems was 52.35% and 4.65%, respectively. The percentage of damaged by Scolytus rugulosus trunk and branch area per tree reach to 58.74 in biological and 0.23 in conventional system. Reduced vitality of apple trees growing with out pesticides and mineral fertilizers in biological growing system was the reason for strong infection of Botryosphaeria obtusa and attack of Synanthedon myopaeformis and Scolytus rugulosus.

scholarly journals Hydraulic resistance components of mature apple trees on rootstocks of different vigours

2007 ◽  
Vol 58 (15-16) ◽  
pp. 4213-4224 ◽  
Author(s):  
S. Cohen ◽  
A. Naor ◽  
J. Bennink ◽  
A. Grava ◽  
M. Tyree
Keyword(s):  
Hydraulic Resistance ◽  
Apple Trees ◽  
Resistance Components ◽  
Mature Apple

Effect of Rate and Timing of Biorational Materials for Control of Second Generation White Apple Leafhopper Nymphs, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 6-7
Author(s):  
E. H. Beers
Keyword(s):  
Second Generation ◽  
Apple Orchard ◽  
Tree Canopy ◽  
Single Tree ◽  
Tree Fruit ◽  
Pre Treatment ◽  
Experimental Treatments ◽  
Extension Center ◽  
Mature Apple

Abstract The test was conducted in a mature apple orchard (several strains of ‘Delicious’) at the Tree Fruit Research & Extension Center, Wenatchee, WA. Treatments were replicated 4 times, with each replicate consisting of a single tree. The experimental design was a RCB, using pre-treatment WALH populations as the blocking factor. The experimental treatments (three types of horticultural mineral oil and Neemix, a neem product) were applied at various rates and timings. The timings were selected based on previous experience of WALH phenology. The late Jul timing (27 Jul) coincides with the appearance of the 4th instars, while the mid-Aug timing (14 Aug) coincides with the first appearance of adults of the second generation. Pesticides were applied with a handgun sprayer to the point of drip. WALH populations were sampled ca. weekly by counting in situ all live nymphs on 20 leaves per tree, distributed throughout the tree canopy.

Diagnosis of retarded growth in an apple orchard

1974 ◽  
Vol 14 (69) ◽  
pp. 577 ◽  
Author(s):  
D Sitepu ◽  
HR Wallace
Keyword(s):  
Soil Moisture ◽  
Tree Growth ◽  
Plant Disease ◽  
Clay Soil ◽  
Apple Orchard ◽  
Simple Approach ◽  
Parasitic Nematodes ◽  
Apple Trees ◽  
Phytophthora Spp ◽  
Retarded Growth

Soil round trees in an Adelaide apple orchard was sampled to assess the concentrations of Pythium spp., Phytophthora spp., stylet-bearing nematodes, soil texture (per cent clay), soil moisture and pH. Correlations between these factors and the size of apple trees (trunk circumference) suggested that parasitic nematodes, Pythium spp. and pH might together be important factors inhibiting tree growth. On the basis of these results, a statement is made on the possible causes of retarded growth in the orchard, and how the problem might be overcome. The main purpose of the work was to devise a simple approach that would enable diagnoses to be made of the causes of retarded growth or poor yield in a crop where several factors seemed to be involved. Such an approach might be useful to extension workers who have to deal with many plant disease problems at the same time.

scholarly journals Effect of Registered and Experimental Insecticides on Second Generation White Apple Leafhopper, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 2-2
Author(s):  
E. H. Beers
Keyword(s):  
Apple Orchard ◽  
Tree Canopy ◽  
2Nd Generation ◽  
Single Tree ◽  
Tree Fruit ◽  
Pre Treatment ◽  
Experimental Treatments ◽  
Extension Center ◽  
Mature Apple

Abstract The test was conducted in a mature apple orchard (several strains of ‘Delicious’) on the grounds of the Tree Fruit Research and Extension Center. Treatments were replicated 4 times, with each replicate consisting of a single tree. The experimental design was a randomized complete block, using pre-treatment leafhopper populations as the blocking factor. The experimental treatments were applied on 21 Aug, which coincided with the 1st appearance of adults of the 2nd generation. Pesticides were applied with a handgun sprayer to the point of drip. WALH populations were sampled c-a. weekly by counting in situ all live nymphs on 20 leaves per tree, distributed throughout the tree canopy.

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