Lethbridge Herald, The (Newspaper) - April 2, 1974, Lethbridge, Alberta
14-THE LETHBRIDQE HERALD -Timday, April 2. 1974 Here are the ACTS The Lethbridge Herald "CHINOOK" Published Every Two Weeks MORE RURAL and Farm Households than ANY OTHER Similar Publication. contains a pleasant Bal- ance of interesting reading for everyone PLUS Informa- tive Advertising Messages. We Invite You to Place Your Advertising Message where it will be sure to reach the greatest number of and urban households. 18, 134 COPIES Delivered to Rural Southern Alberta LARGEST RURAL COVERAGE BY FAR Total Rural and iewtbf Idge City Circulation is Copies a Herald Sales Representative Now and Place Your Advertisement in the Next Chinook! The LetHbrtdge Herald CHINOOK "Serves the South Research Station report Cutworm control By Dr. G. E. SWA1LES Entomologist In 1973, winter wheat was severely damaged by the pale western cutworm in several large areas south of Lethbridge. If dry conditions continue this spring, the area of cutworm damage may be even more extensive. Surveys made last fall revealed a marked increase in moth numbers of both the pale western cutworm and the redbacked cutworm. In addition, evidence of the army cutworn was found near Warner. The cutworms of these three species can cause serious damage to cereals and other crops. The moths lay their eggs in loose soil, mainly on fallow, in August. The eggs of the army cutworm hatch in the fall and the larvae grow to about a half inch long before winter, those of the pale western and redbacked cutworms hatch early in the spring. The larvae of all these species start to feed at or just below the soil surface as soon as green vegetation begins to show. The first evidence that they are present is the appearance of notches in the leaves, or plants that have been cut off at or below the soil surface. Later, patches of bare ground begin to appear, particularly on the sides of knolls. Feeding is usually finished by the third week in June. In 1973, the usual cultural control method of allowing a crust to form on the soil during August, to discourage oviposition by the moths, was difficult because of dry conditions. Since there were large numbers of moths and good oviposition sites were available, damage could be severe in 1974. Consequently, crops must be observed closely this spring. Those grown on fallow will be the most likely to show damage. Damage to winter wheat occurs first and often goes unnoticed or is confused with winterkill. If cutworm damage is suspected, the affected fields should be sampled for larvae. They are usually found in the surface inch of soil and, if more than one per square foot is found over a considerable area, the field will probably need treating with an insecticide. If sufficient damage has occurred to make saving the crop doubtful, an insecticide should'be applied before a new crop is seeded, particularly if the cutworms are still fairly small. Registered insecticides are available for cutworm control. Your district agriculturist should be consulted regarding the products that are available and the application rates.