Caçador, Brazil
Caçador, Brazil

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Becker W.F.,EPAGRI EE de Cacador | Mueller S.,EPAGRI EE de Cacador | dos Santos J.P.,EPAGRI EE de Cacador | Wamser A.F.,EPAGRI EE de Cacador | And 2 more authors.
Horticultura Brasileira | Year: 2011

An alert system for tomato late blight was validated in an Integrated Production System (IP) in the 2006-2007 and 2007-2008 season in Caçador, Santa Catarina State, Brazil. The late blight is a destructive disease and demands 25 or more fungicide sprayings per season in a Conventional Production (CP) System. For the CP area, the chemical control was according to the growers' production systems and consisted of weekly sprays soon after planting. For the IP area, the criterion for the first fungicide spray was according to Machardy (1972) and for subsequent ones according to Wallin (1962), when the disease severity values (DSV) reached eight points. There was a decrease on the fungicide application in the IP, not only in the number of fungicide sprays (23-28%) but also in the amount of active ingredient (34.5-60.9%). Fungicides classified as highly toxic (class I) were not used in IP. There were no significant differences among the use of alert system on IP and the weekly schedules on CP with regard to final disease severity in the 2006-2007 season, but it was significantly lower in the second trial on plants for IP area. The IP system significantly increased tomato yield (7.6-25.5%) compared with CP system and reduced fungicide cost up to US$539/ha. The use of alert system could be a valuable and affordable tool in managing tomato late blight in Integrated Production of tomatoes in Caçador.


Two warning systems for late blight in tomato were evaluated in two growing seasons in Caçador Municipality, Santa Catarina State (SC), Brazil. In the first growing season, as warming for fungicide spraying in late blight control, the systems MacHardy (modified) and Colpam 40® were compared to the conventional method based on the calendar in the hybrid 'Carmen' and the cultivar 'Santa Clara'. Both warning systems led to 34.6% and 42.3% reduction, respectively, in fungicide spraying, relative to the conventional method. The hybrid Carmen had higher productivity than 'Santa Clara'; however, there was no significant difference between the warning systems and the conventional method for the same cultivar. There was no significant difference between the conventional method and Colpan 40 ® concerning late blight control for the hybrid 'Carmen'. In the second growing season, only the hybrid 'Carmen' was used to compare both warning systems with the conventional method, and Colpan 40® was evaluated at two severity levels (8 and 10). There was no significant difference in the productivity among treatments. As regards spraying frequency there was a decrease by 42.8% and 60.7% for the levels 8 and 10, respectively, with Colpan 40® and by 39.2% with MacHardy system relative to the conventional method. Treatments were not significantly different regarding late blight, except for the highest severity level with Colpan 40® in which the disease intensity was higher. This work demonstrated the feasibility of both warning systems for late blight control in the region of Caçador Municipality.


Wamser A.F.,EPAGRI EE de Cacador | Mueller S.,EPAGRI EE de Cacador | Suzuki A.,EPAGRI EE de Cacador | Becker W.F.,EPAGRI EE de Cacador | dos Santos J.P.,EPAGRI EE de Cacador
Horticultura Brasileira | Year: 2012

Farmers of Caçador, Santa Catarina State, Brazil, need experimental results of tomato super density cropping system, since the ecological conditions of this region permit them decide to adopt this system or not. The aim of this work was to evaluate the tomato super density cropping system with hybrids used in Caçador. Two experiments were carried out at Epagri, Experimental Station of Caçador, during the 2007/2008 and 2008/2009 harvest period. The treatments in 2007/2008 were the combination of two hybrids (Miramar and T92), two methods of staking (in vertical and "V") and two methods of training plants (one stem per plant in the spacing of 0.15 m between plants and two stems per plant in the spacing of 0.3 m between plants). In 2008/2009, the treatments were the combination of two hybrids (Paron and Plutão) and two super density methods of training plants (one stem per plant in the spacing of 0.15 m between plants and two stems per plant in the spacing of 0.3 m between plants) plus the traditional density and method of training plants (two stems per plant in the spacing of 0.6 m between plants). The experimental design was of randomized complete blocks with four replications in a split-split-plot, in 2007/2008, and a split-plot in the 2008/2009 season. All treatments had 44,444 stems/ha, except for the treatments with traditional methods of training plants (22,222 stems/ha). The variables analyzed were total, marketable and unmarketable yield, average mass of fruits, marketable and unmarketable percentage of fruits in relation to the total number of fruits, and severity of leaf diseases. The tomato hybrids do not interfere in agronomic responses to the super density of plants. The super density of plants increased, on average, 73.2% the marketable yield, in relation to the traditional density of plants. The marketable yield of the super density of plants in the "V" staking was 19.2% higher than the super density of plants in the vertically staking. The plant training with one stem per plant increased 10.4% the marketable yield in relation to the plant training with two stems per plant in the super density of plants. The super density of plants increased the leaf severity of early blight, in relation to the traditional density of plants.

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