Possibility of monitoring insecticide resistance in the diamondback moth by analyzing the insensitivity of cholinesterase (ChE) which is resistant to organophosphates and carbamates was investigated. Four kinds of ChE genotypes were found and inherited by incomplete dominance factors. Against propoxur and monocrotophos, each ChE genotype showed LD50 in proportion to the values of I50. Differenc...

Diamondback moth (DBM), Plutella xylostella L. is the most injurious defoliage insect pest of canola in Ardabil province of Iran. It occurs annually and causes damage in canola fields. This study was performed to identify QTLs controlling resistance to diamondback moth using SSR and RAPD markers. An F2:4 population of 180 families derived from crossing between cv. ‘SLMO46’ and cv. ‘Quantum’ wer...

Toxicity of 17 commonly used insecticides used to control diamondback moth, Plutella xylostella (L.) was evaluated against adults of Cotesia plutellae Kurdjumov. The insecticide concentrations studied were equivalent to those recommended in the field. Adults of the parasitoid were released into exposure kits with fresh dry insecticide film for 24 hours, at which time mortalities were noted. The...

High levels of resistance to Bacillus thuringiensis Berliner in diamondback moth Plutella xylostella (L.), (LC50 more than 280 ppm) was observed in a watercress greenhouse in Osaka Prefecture in 1988. Populations of egg, larva, pupa and adult of diamondback moth were monitored weekly throughout 1988. Population of the larva fluctuated from nearly 0 to 1,300,000. Three control methods were attem...

Laboratory tests with Diadegma insulare (Cresson), a parasitoid of the diamondback moth ( Plutella xylostella (L.)), were conducted to evaluate the viability of cocoons stored at 4 ° C for varying lengths of time and also the effects of parasitism by D. insulare on the feeding rate of diamondback moth larvae. The percentage of adults emerging from cocoons declined steadily with time spent in st...

Laboratory bioassays were conducted to determine the response of larvae of a susceptible strain of diamondback moth Plutella xylostella (L.) from the Rio Grande Valley of south Texas to five classes of insecticides. Test insecticides were permethrin, methamidophos, endosulfan, methomyl and Bacillus thuringiensis. Three monitoring techniques were developed and tested as methods of determining th...

A new insect growth regulator, Hoe 522 (CME-134), was tested in the field in the northern Philippines for the control of diamondback moth, Plutella xylostella L which had developed resistance to a large number of insecticides. Hoe 522 was found to be highly effective against diamondback moth populations at all rates from 15 to 105 g Al/ha and performed significantly better than reference produc...

Thirty-nine commercial varieties of head cabbage were evaluated for feeding preference of the diamondback moth (DBM), Plutella xylostella, at Kula, Hawaii, USA. Varieties were evaluated for density of caterpillars, extent of feeding damage and percentage of marketable heads. Twelve out of 39 (31%) varieties that showed the least DBM caterpillar damage and produced high percentage of marketable ...

The susceptibility of two New Zealand populations of diamondback moth, Plutella xylostella, to insecticides from three classes was compared with the susceptibility of a standard North American population (Geneva 88) in laboratory assays at the New York Experiment Station during 1993. Leaf dip assays showed that the New Zealand populations had developed moderate resistance to permethrin compared...