Cantaloupe Cucumis melo




Дата канвертавання22.04.2016
Памер35.27 Kb.
Cantaloupe (Cucumis melo ‘Athena’) Tim Momol, Steve Olson,

Gummy Stem Blight (caused by fungus Didymella bryoniae) Laura Ritchie, and Jackie

Snell

University of Florida/IFAS



NFREC

155 Research Road

Quincy, FL 32351
EFFICACY OF SEVERAL PRODUCTS ON GUMMY STEM BLIGHT IN CANTALOUPE, 2004: Several compounds were tested and evaluated for control of gummy stem blight in a field experiment located in Quincy Florida. Naturally occurring Didymella bryoniae was the source of infections. With the exception of plants designated for the untreated control, all plants received a drench treatment of Platinum 2SC and Ridomil Gold 4EC. There was one treatment in which plants also received a soil drench of Heads Up the day of transplanting (Table 1). Foliar treatments of Bravo WeatherStik, Amistar 80WG, Tanos and Mankocide were applied weekly or on alternate weeks (as per experiment set up) in the field using a 6 nozzle peanut boom and back pack, CO2-pressurized at 60 psi, and calibrated at 57.9 gallons per acre. Controls received no treatment. Treatments were arranged in randomized complete block design with 4 replications. Cantaloupe seedlings were transplanted March 22nd on to raised beds previously fumigated with methyl-bromide (67%)+chloropcrin (33%) and covered with black polyethylene (mulch), drip irrigated and fertilized (195-60-195 lb/A N-P2O5-K2O). Each plot consisted of 2 rows, each 70 feet long and containing 40 plants spaced 20 inches apart. Foliar treatments in the field were applied weekly beginning March 31st and ending May 19th for a total of 8 applications. Average temperatures were as follows: March (22-31) 60.9 oF, April 63.3 oF, May 74.0 oF, and June 77.4 oF. The total rainfall for each month was as follows: March (22-31) 3.7 inches, April 7.6 inches, May 0.33 inches and June 25.5 inches. Foliar disease was assessed on April 15th, April 30th, May 12th, May 24th, June 2nd, and June 15th using the Horsfall-Barratt rating scale and converted to percent severity values. Plants in one treatment were treated with LPE-94 June 4th and fruit in another treatment were treated with CaCl2 June 7th (Table 1). Fruit were harvested June 7th, June 10th, and June 14th and weighed. The SAS system was used to separate the means of the disease severity data (Table 1) and the fruit yield data (Table 2).

Table 1. Efficacy of the products on gummy stem blight







% Disease Severity Spring 2004z

Treatmentsy

April 15

April 30

May 12

May 24

June 2

June 15

UTCx


0a

0a

0a

1.17a

4.11a

9.37a

Bravo+Amistarw


0a

0a

0a

0b

0b

0b


Bravo+Amistar, LPE-94w,v

0a

0a

0a

0b

0b

1.19b


Bravo+Amistar, CaCl2w,u

0a

0a

0a

0b

0b

0.29b


Bravo+Amistar, Heads Upw,t

0a

0a

0a

0b

0b

0.89b


Tanos+Mankocide, Bravo+Mankocides

0a

0a

0a

0b

0b

1.79b



z Means with the same letter are not significantly different (P=0.05) by Duncan’s multiple range test (SAS)

y All treatments except the UTC received a drench treatment of Platinum 2SC (8 oz/A) and Ridomil Gold 4EC (2 oz/A)

x UTC=Untreated Control

w Bravo WeatherStik (2 pt/A) + Amistar 80WG (4 oz/A), alternating a tank mix of Bravo+Amistar with Bravo alone, on a weekly basis

v LPE-94 (1 part product to 1000 parts water) applied before harvest

u CaCl2 (1 part product to 80 parts water) applied after harvest

t Heads Up (2 g/L) applied as root dip before transplanting

s Tanos (10 oz/A) + Mankocide (2.5 lb/A) alternated weekly with Bravo WeatherStik (2 pt/A) + Mankocide (2.5 lb/A)

Table 2. Yield Per Day Harvested and Total Yield.







Yield z (cwt/A) y

Treatmentsx

June 7

June 10

June 14

Total

UTCw



237.9a

126.8ab

38.7b

403.4a

Bravo+Amistarv



222.5a

131.4ab

39.5b

393.4a

Bravo+Amistar, LPE-94v,u

217.6a

151.6a

37.7b

406.8a

Bravo+Amistar, CaCl2v,t

248.5a

97.1b

47.6ab

393.3a

Bravo+Amistar, Heads Upv,s

208.4a

108.3b

73.3a

390a

Tanos+Mankocide, Bravo+Mankocider

220.6a

115.3ab

56.4ab

392.3a


z Means with the same letter are not significantly different (P=0.05) by Duncan’s multiple range test (SAS)

y Formula used to obtain yield data: (plot weight)(0.484)=cwt/A

x All treatments except the UTC received a drench treatment of Platinum 2SC (8 oz/A) and Ridomil Gold 4EC (2 oz/A)

w UTC=Untreated Control

v Bravo WeatherStik (2 pt/A) + Amistar 80WG (4 oz/A), alternating a tank mix of Bravo+Amistar with Bravo alone, on a weekly basis

u LPE-94 (1 part product to 1000 parts water) applied before harvest

t CaCl2 (1 part product to 80 parts water) applied after harvest

s Heads Up (2 g/L) applied as root dip before transplanting

r Tanos (10 oz/A) + Mankocide (2.5 lb/A) alternated weekly with Bravo WeatherStik (2 pt/A) + Mankocide (2.5 lb/A)


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