impacto da irrigação por aspersão convencional na dinâmica populacional da traça-das-crucíferas em plantas de repolho impact of sprinkler irrigation on diamondback moth injuries on cabbage plants
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Abstract
Para avaliar o impacto da irrigação via aspersão convencional na dinâmica populacional da traça-das-crucíferas foram realizados dois experimentos. O primeiro composto por dois ensaios, foi realizado na Embrapa Hortaliças. No primeiro ensaio, larvas de terceiro e quarto estágio foram colocadas em 16 plantas de repolho, cv. Kenzan, com folhas abertas, 40 dias após a semeadura e em 16 plantas iniciando a formação da cabeça. Após um período de 24 horas, os vasos com as plantas foram conduzidos ao campo, onde metade deles recebeu irrigação por aspersão convencional. A lâmina aplicada foi de 23 mm em trinta minutos. A outra metade das plantas serviu como testemunha. No segundo ensaio, realizado com a mesma metodologia, larvas de primeiro e segundo estágios foram colocadas em quarenta plantas. No segundo experimento realizado na Fazenda Água Limpa, Universidade de Brasília, o delineamento experimental utilizado foi inteiramente casualizado, com três tratamentos (inseticida clorfluazuron com aplicações semanais de 400 ml/ha; clorfluazuron aplicado quando atingido o nível de dano de seis furos, em média, nas quatro folhas centrais e testemunha sem inseticida), em dez repetições, totalizando trinta parcelas com 24 plantas cada uma. Foram aplicados 400 mm de água à cultura durante o ciclo. As pulverizações semanais do inseticida e o acompanhamento do nível de dano em cinco plantas ao acaso, em cada parcela, tiveram início no 36(0) dia após o transplante. As notas foram atribuídas (104 dias após o transplante) às oito plantas centrais das parcelas, conforme a escala: 01 = folhas raspadas ou sem danos, 02 = folhas com furos pequenos (pouco dano); 03 = folhas com furos grandes (muito dano); 04 = plantas totalmente danificadas. Verificou-se que a precipitação tem influência no controle da traça-das-crucíferas, promovendo 52% de remoção de larvas quando as plantas estavam com as folhas abertas e quando larvas de primeiro e segundo estágios foram utilizadas. Não foi observada diferença estatística entre os tratamentos "inseticida semanal" e "inseticida aplicado quando atingido o nível de dano". Também não houve diferença estatística entre os tratamentos "inseticida aplicado quando atingido o nível de dano" e a testemunha.
Two experiments were carried out to evaluate the impact of sprinkler irrigation on Diamondback moth injuries on cabbage plants (cv. Kenzan). The first experiment, composed by two trials, was carried out at Embrapa Hortaliças. In the first trial, larvae of third and forth stages were transferred to 16 plants with open leaves, 40 days after sowing and on 16 'Kenzan' plants beginning to form head. After 24 hours, pots with cabbage plants were transferred to the field, where half of them were irrigated using sprinkler irrigation system for 30 minutes per day, receiving depth of water of 23 mm. The other half of the pots were the control treatment. On the second trial, carried out at the same way, larvae of the first and second stage were transferred to 40 cabbage plants. The second experiment was carried out at Fazenda Água Limpa, University of Brasília. The experimental design was completely randomized with three treatments (clorfluazuron weekly applied - 400 ml/ha; clorfluazuron applied at crop economic threshold and control, without clorfluazuron) in 10 replicates, total of 30 plots with 24 plants each. It was applied 400 mm of water during crop cycle. The weekly clorfluazuron applications and the weekly crop economic threshold evaluation began 36 days after transplanting. Grades were attributed to eight plants per plot during harvest according to the degree of injuries observed: 01= no damage; 02= few damages; 03= leaves with many injuries; 04= plant totally damaged. Sprinkler irrigation has influence on Diamondback moth control by removing 52% of the larvae when first and second stage larvae were used. No statistically significant difference was observed between the grades of the plants that received clorfluazuron weekly and the plants that received it at crop economic threshold and between the latter treatment and the control.
Two experiments were carried out to evaluate the impact of sprinkler irrigation on Diamondback moth injuries on cabbage plants (cv. Kenzan). The first experiment, composed by two trials, was carried out at Embrapa Hortaliças. In the first trial, larvae of third and forth stages were transferred to 16 plants with open leaves, 40 days after sowing and on 16 'Kenzan' plants beginning to form head. After 24 hours, pots with cabbage plants were transferred to the field, where half of them were irrigated using sprinkler irrigation system for 30 minutes per day, receiving depth of water of 23 mm. The other half of the pots were the control treatment. On the second trial, carried out at the same way, larvae of the first and second stage were transferred to 40 cabbage plants. The second experiment was carried out at Fazenda Água Limpa, University of Brasília. The experimental design was completely randomized with three treatments (clorfluazuron weekly applied - 400 ml/ha; clorfluazuron applied at crop economic threshold and control, without clorfluazuron) in 10 replicates, total of 30 plots with 24 plants each. It was applied 400 mm of water during crop cycle. The weekly clorfluazuron applications and the weekly crop economic threshold evaluation began 36 days after transplanting. Grades were attributed to eight plants per plot during harvest according to the degree of injuries observed: 01= no damage; 02= few damages; 03= leaves with many injuries; 04= plant totally damaged. Sprinkler irrigation has influence on Diamondback moth control by removing 52% of the larvae when first and second stage larvae were used. No statistically significant difference was observed between the grades of the plants that received clorfluazuron weekly and the plants that received it at crop economic threshold and between the latter treatment and the control.
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oliveira2000horticulturaimpacto
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| Authors | ;Aurélio Tinoco de Oliveira;Ana Maria R. Junqueira;Félix Humberto França |
| Journal | research on biomedical engineering |
| Year | 2000 |
| DOI |
10.1590/S0102-05362000000100008
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