Carrot root fly

Phenylpropanes Methylisoeugenol (D 22,2.1) Oviposition stimulant of the carrot root fly... 

Larvae of the carrot rust fly will feed on the roots of all members of this family, but it is only a major pest of carrots. Barriers and crop... 

Myristicin has not been reported to possess antifungal activity, and therefore is not a phytoalexin according to the standard interpretation of this term (1 ). It does, however, potentiate the activity of the insecticide, paraoxon, in flies by inhibiting its degradation (2), and may in similar manner potentiate the action of phytoalexins of carrot root (falcarinol, falcarindiol,... 

Roots with dark tunnels. Causes Carrot weevils carrot rust flies carrot beetles. 

Diazinon, an organophosphoras compound with an anticholinesterase mode of action, was released for experimental evaluation in the early 1950s. Diazinon is now used extensively hy commercial and home applicators in a variety of formulations to control flies, cockroaches, lice on sheep, insect pests of ornamental plants and food crops (especially com, rice, onions, and sweet potatoes), forage crops such as alfalfa, and nematodes and soil insects in turf, lawns, and croplands. Diazinon is the most widely used organophosphorus pesticide in Pakistan to control cabbage root fly and carrot fly. In 1992, more than 612,000 kg of diazinon were used in California on alfalfa, nuts, stone fmits, vegetables, and other crops. 

Fleece or net crop covers will stop egg laying of some pests such as carrot fly. On a field scale it is expensive although a very effective optiom hr swedes this is the only method available to growers to control cabbage root fly as there are cmrently no suitable recommended chemicals. 

On a Umited scale, crop covers are used over susceptible crops when there is likely to be damage. These crop covers form veiy effective barriers against pests such as carrot and cabbage root fly and caterpillars. Other than cost the problem with crop covers is that they have to be removed before weeding can be carried out. 

Jones, O.T. T.H. Coaker. 1977. Oriented responses of carrot fly larvae, Psila rosae, to plant odours, carbon dioxide and carrot root volatiles. Physiol. Entomol. 2 189-197. 

Cole, R.A. (1985) Relationship between the concentration of chlorogenic acid in carrot root and the incidence of carrot fly larval damage. Ann. Appl. Biol, 106, 211-217. 

Small, shiny black flies lay eggs in small clusters near host plants, starting in late spring. The larvae are creamy-white, up to Vz in (1 cm) long. Pupae, and sometimes larvae, overwinter in soil and roots of carrot and parsnip. There are two or three generations per year, the first causing most damage. 

What to do Grow in a well-drained site. Grow a resistant variety such as Avonresister. Earth up in summer to stop the spores of black canker from reaching the roots. Use close spacing to produce smaller roots that may be less susceptible to some cankers. Control carrot fly (q.v.). Use a crop rotation. 

Root knot nematodes, 309,400 bean and, 33 cabbage and, 54 carrot and, 60,61 herbs and, 116 lettuce and, 138 I.iatris and, 140 okra and, 154,430 Paeonia and. 159-60 potato and,189,190,191 sanitation and. 422 sweet potato and, 221 tomato and, 230,400 vegetables and, 246 Root maggot fly barriers, 445 Root maggots... 

Carrot fly, cutworms, willow-carrot aphids and nematodes, and the diseases violet root roL black rot, leaf bhght, cavity spof scab and Sclerotinia rot are the main problems in the growing of the crop. Some varieties are more susceptible to cavity spot than others. 

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