scholarly journals Flea Beetle Control in Broccoli, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 86-86
Author(s):  
Mohammed Al-Doghairi ◽  
Whitney Cranshaw ◽  
D. Casey Sclar ◽  
Dan Gerace ◽  
Andrea Tupy
Keyword(s):  
Block Design ◽  
Flea Beetle ◽  
Field Research ◽  
Compressed Air ◽  
Research Center ◽  
Row Spacing ◽  
Flea Beetles ◽  
Randomized Complete Block Design ◽  
Visual Observations

Abstract Trials were conducted on spring-transplanted (13 May) broccoli (cv. Green Comet) at the Horticulture Field Research Center in Ft. Collins, CO. Individual plots consisted 20 ft long single rows with 15-in in-row spacing, arranged in a randomized complete block design with four replications. Insecticide applications were made 3 Jun and 21 Jun using a CO2 compressed air sprayer delivering 15 gpa at 30 psi in two passes directed along the sides of the planting. An organosilicant spreader (Kinetic, 6 fl oz/A) was added to all treatments. Evaluations were made by visual observations of flea beetles on six plants/plot.

scholarly journals Evaluation of Selected Bacillus Thuringiensis Insecticides for Control of Soybean Looper in North Louisiana, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 238-238 ◽  
Author(s):  
Rosanne N. Mascarenhas ◽  
Alan T. Wier ◽  
David J. Boethel ◽  
P. Scott Lingren ◽  
B. Rogers Leonard
Keyword(s):  
Block Design ◽  
Experimental Period ◽  
Compressed Air ◽  
Row Spacing ◽  
Research Station ◽  
Hollow Cone ◽  
Randomized Complete Block Design ◽  
Period Data ◽  
Soybean Looper ◽  
North Louisiana

Abstract A field study was conducted at the Macon Ridge Branch, Northeast Research Station, located near Winnsboro (Franklin Parish), Louisiana, to evaluate the efficacy of several B. thuringiensis insecticides for soybean looper control. Test plots were 50 ft long by 5 rows with a 40 inch row spacing and were arranged in a randomized complete block design with four replications. Insecticides were applied with a tractor and compressed air sprayer calibrated to deliver 10 gpa at 38 psi through TX8 hollow cone nozzles (2 per row). Insecticide treatments were applied to soybeans in the R5 stage of growth (beginning seed) on 25 Aug. Posttreatment counts, consisting of 25 sweeps per plot, were taken with a 15 inch diameter muslin net at 2, 5, and 7 DAT. No rainfall occurred and the plots were not irrigated during the experimental period. Data were analyzed using analysis of variance followed by means separation according to DMRT.

scholarly journals Flea Beetle Control on Broccoli, Ft. Collins, Co, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 87-87
Author(s):  
Whitney Cranshaw ◽  
D. Casey Sclar ◽  
Aaron Spriggs ◽  
Jason Bishop
Keyword(s):  
Diatomaceous Earth ◽  
Flea Beetle ◽  
Field Research ◽  
Compressed Air ◽  
Row Spacing ◽  
State University ◽  
Single Row ◽  
Colorado State University ◽  
Hand Pump ◽  
University Department

Abstract The experiment was conducted at the Colorado State University Department of Horticulture Field Research Center, Ft. Collins, CO. Plots were established 13 May by use of transplants, with an 18-inch in-row spacing. Individual plots were single row, 20-ft in length, arranged in a RCBD with 4 replications. Insecticides were applied 27 June and 17 July using a CO2 compressed air sprayer delivering 15 gal/A at 45 psi. Food sprays (Good Bug Power Meal) were applied with a hand pump mister on 27 June, 5 July, 13 July and 24 July to cover the plants. Diatomaceous earth (Organic Plus Crawling Insect Killer) was applied 27 June, 4 July, and 17 July. Treatments were hand applied on the first two applications; the use of a Chapin Duster was utilized better to cover foliage on the latter treatment. Evaluations were made by counting all flea beetles on 6 sequential plants in the center of each plot.

ASSESSING THE SUSCEPTIBILITY OF CRUCIFER SEEDLINGS TO FLEA BEETLE (Phyllotreta spp.) DAMAGE

1988 ◽  
Vol 68 (1) ◽  
pp. 85-93 ◽  
Author(s):  
R. J. LAMB
Keyword(s):  
Field Study ◽  
Block Design ◽  
Flea Beetle ◽  
Pest Resistance ◽  
Phyllotreta Cruciferae ◽  
Phyllotreta Striolata ◽  
Flea Beetles ◽  
Randomized Complete Block Design ◽  
Beetle Damage

A 5-yr field study to develop a method for assessing the susceptibility of crucifer seedlings to damage by the flea beetles Phyllotreta cruciferae (Goeze) and Phyllotreta striolata (F.) is described. The recommended method consisted of five replicate 5-m rows per cultivar in a randomized complete-block design. Each test was sown three times at weekly intervals, to assure that at least one test received an appropriate level of flea beetle damage. Each test was assessed 4–5 wk after seeding by counting the number of surviving seedlings in each row and by weighing the dried aboveground portion of 10 randomly selected seedlings, although the latter discriminated fewer lines. The damage caused by flea beetles varied spatially, but this source of variation was minor and did not compromise the tests. This method proved adequate for discriminating among crucifer species and agronomically similar cultivars, some of which showed consistent, significant differences in their responses to flea beettle damage.Key words: Crucifer, rapeseed, flea beetle, pest resistance

scholarly journals Insect Pest Diversity and Damage Assessment in Field Grown Okra (Abelmoschus esculentus (L.) Moench) in the Coastal Savannah Agro-ecological Zone of Ghana

2019 ◽  
pp. 1-10
Author(s):  
Frederick Boateng ◽  
Samuel Amiteye ◽  
Andrew Sarkodie Appiah ◽  
Dinah Marri ◽  
Benjamin Kwasi Offei ◽  
...  
Keyword(s):  
Myzus Persicae ◽  
Block Design ◽  
Flea Beetle ◽  
Leaf Damage ◽  
Insect Species ◽  
Severe Damage ◽  
Flea Beetles ◽  
Fruiting Stage ◽  
Randomized Complete Block Design ◽  
Test Plants

Aims: The specific objectives of this study were: to identify the diversity of insect species associated with ten okra cultivars, and to assess the abundance of the insect species and the extent of leaf damage during vegetative, flowering and fruiting stages of ten okra cultivars under field conditions. Study Design:  The experimental treatments were deployed in a Randomized Complete Block Design (RCBD), replicated four times. Place and Duration of Study: The research was conducted at Nuclear Agriculture Research Center (NARC) farms and the laboratories of Radiation Entomology and Pest Management Center (REPMC) of Biotechnology and Nuclear Agriculture Research Institute (BNARI), between July 2017 and March 2018. The study area is located at Kwabenya, Accra on latitude 5º40' N, longitude 0º13' W with Ochrosol (Ferric Acrisol) soil type, derived from quartzite Schist. Methodology: Plant materials used for the study consisted of five local and five exotic okra cultivars. The local cultivars were Asutem (AS), Togo (TG), Labadi dwarf (LD), Kwab (K1) and Adom (AD). These were obtained from the market (Asamankese and Dome) and okra farmers’ fields. The exotic cultivars were Lucky 19F1 (LF1), F1 Kirene (F1K), F1 Sahari (F1S), Kirikou F1 (KF1) and Clemson Spineless (CS). These cultivars were obtained from a commercial seed shop, Technisem, Accra. Land preparation of the research site involved plowing and harrowing. The prepared land was lined and pegged into 40 plots using a Randomized Complete Block Design with four replications. Each replicate measured 35 m x 7 m and separated by 2 m from each other with 10 subplots within a block. Each subplot measured 3 m x 3 m and spaced from one another by 1 m. The total size of the experimental area was 646 m2. The okra seeds were manually sown to a depth of 2 cm directly at a spacing of 0.50 m x 0.60 m. Four seeds per hill were sown and later thinned to one seedling per hill after emergence. Field management practices such as weed control and watering were done as and when required.  Data on insects were collected from five okra plants randomly selected from the middle rows. Okra leaves were carefully examined by observing both the abaxial and adaxial surfaces. Insects found on the surfaces of the leaves were identified, counted manually and recorded as either major or minor based on their incidence pattern. Data was taken daily because the ten cultivars have different vegetative, flowering and fruiting dates. Insects were counted between the hours of 6.00 am and 8.00 am when they are inactive and cannot fly. In order to determine the extent of leaf damage, the following described scoring scale was designed for this work. Leaf damage was determined by counting the total number of perforations created by the insects in all leaves found on the five randomly selected test plants. This was then divided by the total number of leaves on the five selected test plants to obtain the average number of perforations per leaf. Leaves were visually assessed and scored for severity of damage using a damage rating where; 1 very mild damage (1 to 15 perforations); 2 mild damage (16 to 30 perforations); 3 moderately severe damage (31 to 45 perforations); 4 very severe damage (46 to 60 perforations); 5 extremely severe damage (more than 60 perforations). Results: A total of thirteen insect pests belonging to six orders (Coleoptera, Homoptera, Lepidoptera, Hymenoptera, Orthoptera and Mantodea), and thirteen families Chrysomelidae, Coccinellidae, Pyrgomorphidae, Meloidae, Noctuidae, Nolidae, Cicadellidae, Aleyrodidae, Aphididae, Pseudococcidae, Mantidae, Formicidae and Acrididae) were found to be abundant in the field. Among these, the highest number of insect species belonged to Homoptera group viz., Green Peach Aphid (Myzus persicae) Okra leafhopper (Amrasca biguttula), Whitefly (Bemisia tabaci), and striped mealybug (Ferrisia virgata) followed by Coleoptera (Flea beetle (Podagrica sp.) and Ladybird beetle (Cheilomenes lunata). On the vegetative stage of the okra, Flea beetle had the highest number on Lucky 19F1 (36.00±9.66 insects/plant). During the flowering stage, plants of L-19F1 had the highest mean number of Flea beetles (32.25±10.30 insects/plant). On the fruiting stage, plants of LD had the highest mean abundance of flea beetles (47.50±13.53 per plant). Conclusion: A total of 1,439 insects were recorded at the fruiting stage which was significantly higher than the flowering (855) and vegetative stages (693). Mean Whitefly counts were relatively low at the vegetative, flowering and fruiting stages of the cultivars. However, Flea beetle (Podagrica sp.) and Green Peach aphids (Myzus persicae) mean numbers increased progressively throughout all the stages. In the present study, the severity of leaf damage was significantly higher at the fruiting stage compared with the flowering and vegetative stages. Plants of cultivars LD and AS were the most promising recording the least leaf damage (111.95) and (119.10) respectively.

scholarly journals Control of Western Black Flea Beettle on Mustard Greens, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 110-110
Author(s):  
Mohammed Al-Doghairi ◽  
Whitney Cranshaw
Keyword(s):  
Experimental Design ◽  
Field Research ◽  
Compressed Air ◽  
Row Spacing ◽  
Flea Beetles

Abstract This trial was conducted at the Horticulture Field Research Farm north of Ft. Collins, CO. Plots were established by transplanting, 4 June, “Green Wave” mustard to single 32-in rows, at 12-inch in-row spacing. Experimental design was a RCB, with 4 replications and individual plots consisted of two 15-ft rows. Treatments were first applied 14 Jun, using a CO2 compressed air sprayer delivering 18 gpa. A reapplication was made 17 Jun. Evaluations were made by counting all flea beetles on the center 4 plants from each row per plot (8 plants/plot total).

scholarly journals EFEKTIVITAS EKSTRAK DAUN NIMBA (Azadirachta indica A. Juss) DALAM MENGATASI SERANGAN LIRIOMYZA SPP PADA TANAMAN BAWANG MERAH LEMBAH PALU

2019 ◽  
Vol 9 (2) ◽  
pp. 66-71
Author(s):  
Arfan ◽  
Ratnawati ◽  
Hasmari Noer ◽  
Lisa Indriani ◽  
Asli ◽  
...  
Keyword(s):  
Analysis Of Variance ◽  
Azadirachta Indica ◽  
Attack Rate ◽  
Block Design ◽  
Field Research ◽  
Leaf Extracts ◽  
The Real ◽  
Randomized Complete Block Design ◽  
Central Sulawesi

The purposes of this research the examine the effectiveness various concentrations neem leaf ekstract on the intensity of attack Liriomyza spp on shallot Lembah Palu variety . Field research was carried out in Guntarano Village, Tanantovea Subdistrict, Donggala Regency, Central Sulawesi.  This research conducted from February to April 2016 .The experiment was done using Randomized Complete Block  Design with three replications, consists of six  treatments, i.e. P0 : control (without aplication neem leaf ekstract); P1: neem leaf ekstract 10 gr /litre;  P2 : neem leaf ekstract 20 gr / litre; P3 : neem leaf ekstract 30 gr / litre; P4 : neem leaf ekstract 40 gr / litre; P5 : neem leaf ekstract 50 gr / litre. To find out the effect of threatment, the analysis of variance, and the real influence is continued with the standard  ά = 0.05 BNT test.  The results showed that use of seed and leaf extracts of neem plant can control Liriomyza spp attack, only 3,04 percent of attack rate and shallot Lembah Palu variety productivity is 3,02/area.

scholarly journals Verification of disease management technology on lentil against Stemphylium blight at farmer’s field in Nepal

2018 ◽  
Vol 1 (1) ◽  
pp. 51-61
Author(s):  
Subash Subedi ◽  
Sarswati Neupane
Keyword(s):  
Lens Culinaris ◽  
Block Design ◽  
Cost Ratio ◽  
Row Spacing ◽  
Benefit Cost Ratio ◽  
Plot Size ◽  
Management Technology ◽  
Randomized Complete Block Design ◽  
Stemphylium Blight ◽  
Benefit Cost

Technologies generated from lentil (Lens culinaris Medik) stemphylium blight (Stemphylium botryosum Walr) management experiments were verified at farmers field of 5 districts viz., Chitawan, Rautahat, Dang, Parsa and Banke during two winter seasons of 2013-2014 and 2014- 2015. The experiment was laid out in randomized complete block design with factorial arrangement of treatments and replicated 4 times. The plot size was 340 m2 (1 Kattha) with 25 cm row to row spacing. There were altogether 3 factors of the experiment i.e. year (2013-2014 and 2014-2015), location (5 districts) and package of practice (improved and farmers practice). The higher crop yield (1142.50 kg/ha) with lower disease index (34.95%) and higher benefit cost ratio of 2.42 were recorded in the farmers field of Banke district following seed rate (30 kg/ha), 8 hour primed improved variety (Black lentil), fertilizer doze of (20:40:20 NPK kg/ha+ 1 kg/ha B basal doze) and subsequent 3 sprays of Dithane M-45 @ 2.5 g/l of water at 10 days interval.

Varietal performance of transplant aman rice under different hill densities

1970 ◽  
Vol 34 (1) ◽  
pp. 33-39 ◽  
Author(s):  
MAT Sohel ◽  
MAB Siddique ◽  
M Asaduzzaman ◽  
MN Alam ◽  
MM Karim
Keyword(s):  
Grain Yield ◽  
Key Words ◽  
Harvest Index ◽  
Block Design ◽  
Grain Weight ◽  
Row Spacing ◽  
Lower Yield ◽  
Straw Yield ◽  
Randomized Complete Block Design ◽  
Biological Yield

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh from July to December 2004 to evaluate the effect of hill spacing on the performance of BRRI dhan40 and BRRI dhan41 as Transplant aman crop. The experiment consisted of five hill spacings viz., 5cm. 10cm, 15 cm, and 25 cm where row to row spacing of 25 cm was kept constant for all treatments. The experiment was laid out in randomized complete block design with four replications. The 25 cm x 5 cm hill spacing produced the tallest plant, highest total number of tillers/hill, bearing tillers/hill lowest number of non-hearing tillers/hill, grain yield and harvest index, while 25 cm x 5 cm hill spacing produced the highest number of sterile spikelets/panicle, straw yield and biological yield. BRRI dhan41 produced higher grain yield (4.7 t/ha) which was the contribution of higher number of grains/panicle and heavier grain weight. Lower yield (4.51 t/ha) was recorded in BRRI dhan40.Key Words: Varietal performance; T. aman rice; hill density.DOI: 10.3329/bjar.v34i1.5750Bangladesh J. Agril. Res. 34(1) : 33-39, March 2009

scholarly journals Colorado Potato Beetle and European Corn Borer Control with Insecticides, Pasquotank Co., Nc, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 131-131
Author(s):  
K. A. Sorensen ◽  
C. Wade Holloway
Keyword(s):  
European Corn Borer ◽  
Block Design ◽  
Fourth Instar ◽  
Row Spacing ◽  
Hollow Cone ◽  
Corn Borer ◽  
Potato Beetle ◽  
Randomized Complete Block Design ◽  
Hill Plots ◽  
Low Rate

Abstract ‘Atlantic’ potatoes were planted in early Mar for Tests 1 and 2 near Elizabeth City, N.C. on 42 inch centers. Plots in Test 1 were 14 ft long and in Test 2 20 ft long, with single row spacing replicated 4 times in a randomized complete block design. Alleys of 5 ft were used between replicates within rows. Treatments in Test 1 and Test 2 were applied with a CO2 pressurized backpack sprayer with a single hollow cone nozzle (18X) operated at 60 psi to deliver 54.5 gal/acre. In Test 1 all treatments were applied on 5, 11 and 18 May. All treatments were applied to Test 2 on 5 May, with the exception of the 1/6 lb rate of Trigard 75WP in combination with Trigard 75WP at 1/3 lb rate which received the combination low rate (1/6 lb) 6 days later. On 11 May applications were applied to all treatments except for Trigard 75WP at the 1/3 lb, 2/3 lb (egg only) and Trigard 75WP 1/3 lb (egg only) plus Trigard 75WP at the 1/6 lb rate. At this time the low rate of the combination Trigard 75WP 1/6 lb rate was applied. Imidan 50WP at 2 lbs and Imidan 50WP at 2 lbs plus Butacide 8EC at 0.5 lbs was applied on 5, 11 and 18 May. Test 1 and Test 2 counts of CPB on 3/hill plots were made 11 and 18 May. Small larvae were assumed to be first and second instar, and large larvae, third and fourth instar. Visual CPB damage ratings were made 18 May and 15 Jun. Visual ECB ratings were made and potatoes harvested and yields recorded 15 Jun.

scholarly journals Onion Thrips Control, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 140-140
Author(s):  
Whitney Cranshaw ◽  
Janson Bishop
Keyword(s):  
Block Design ◽  
Compressed Air ◽  
Onion Thrips ◽  
Randomized Complete Block Design ◽  
Neck Area

Abstract Trials conducted in Fruita, CO, using seeded onions (cv. Brown Beauty) in single rows at 30-in spacing Plots were 20-ft in length arranged in a randomized complete block design with 4 replications. Treatments were applied 20 Jun and 11 Jul using a CO compressed air sprayer delivering 19.2 gpa at 40 psi in two passes directed along the sides of the planting. Evaluations were made by examining 10 plants per plot and counting all thrips present in the neck area of the onions.

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