Use of pesticide and tunnel-type net barrier in pak-choi production

Issue Date

10-2003

Abstract

A study was conducted to compare the amount of pesticides used in open field and in plots with tunnel-type net barrier in pak-choi production. Plot size was 2 x 5 sq. m. and the treatments were spraying of insecticides and no insecticide application. Developed technology for pak-choi production such as raised bed, line sowing of seeds, basal application was 120-30-30 kg NPK/ha. Frequency and amount of insecticides used (on per ha basis) were recorded. Monitoring of pests started 4 days after seedling emergence and twice a week thereafter until harvest. Severity of insect and disease damage was rated following the standard scale set by AVRDC. Plots with insecticide application and tunnel-type net barrier were treated at the same time and only when plants grow under tunnel-type barrier needs to be treated. RCBD was followed in the analysis of variance with seven replications. Two trials were conducted, one in rainy season (September-October 2002) and another in dry season (November-December 2002). During the rainy season trial, tunnel-type net barrier and insecticide application gave significantly lower percent damaged plants due to flea beetles compared with the untreated plants. Similarly, ratings of damage due flee beetle for the two treatments were significantly lower than that for the untreated plants. Percent wire stem and soft rot infection was significantly higher on plants grown under the tunnel-type net barrier. Number of spraying and amount of insecticide sprayed was higher on plots with insecticide application treatments and resulted in significantly higher number and weight of marketable plants per ha were significantly higher in plots with tunnel-type ne t barrier than those plots with or without insecticide treatment. Number of damaged plants due to flea beetle and damage rating were significantly higher on plots with or without insecticide application compared to plots with tunnel-type net barrier. Damage rating due to flea beetle, weight and number of marketable plants per ha in plots with insecticide spraying and in the control plots were comparable.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

17

Issue

2

Page

192-193

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

BRASSICA OLERACEA VAR CAPITATA; PLANT PROTECTION; BIOLOGICAL PLANT PROTECTION; PEST CONTROL; INSECTICIDESS; PESTICIDES; NETTING (PEST CONTROL)

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