Do not use this product if leafminers are present because it is destructive of their parasites. Do not use if psyllids are in the field as carbamates tend to promote development of their populations also if leafminers are present, it may cause outbreaks by destroying their natural enemies.ĬOMMENTS: Some resistance has been documented. Less toxic to natural enemies than many other choices.ĬOMMENTS: Will also control fruitworm, beet armyworm, and cabbage looper. Always read the label of the product being used.ĬOMMENTS: Research information regarding the efficacy of this material for western yellowstriped armyworm is lacking used primarily in the San Joaquin Valley for early season infestations. When choosing a pesticide, consider information relating to air and water quality, resistance management, and the pesticide's properties and application timing. The following are ranked with the pesticides having the greatest IPM value listed first-the most effective and least harmful to natural enemies, honey bees, and the environment are at the top of the table. Not all registered pesticides are listed. Pesticide precautions Protect water Calculate VOCs Protect bees Ground applications provide maximum effectiveness of the pesticide. Picking large numbers of fruit each week and assessing percent damage may not be economically feasible. On average, if one or more larvae or egg masses are found in 5 minutes, treatments may be justified. A 5-minute timed search is useful in determining the need for treatment. Pheromone traps are useful for determining when major flights occur, but not for predicting damage. In fresh market tomatoes, begin sampling when fruit appears. In general, this pest is larger and thus more difficult to control than beet armyworm. A sequential sampling technique (PDF) is also available to help reduce the number of samples required to reach a treatment decision. The treatment threshold is 3.25% damaged fruit. Record observations on a monitoring form (PDF). Count fruit as damaged if it has any hole deeper than 0.1 inch (2.5 mm), if the hole is contaminated with feces, or if any larvae are present in the fruit.
If damaged fruit are found, determine the amount of damage present and the size and species of the worms (armyworms and fruitworms). Pick at least 100 fruit at random while walking through the field, being careful not to select red fruit when the majority of fruit are green.
Treatment is not necessary before this size because the damaged fruit will fall from the plant and will be replaced by more fruit. In processing tomatoes, begin sampling fruit when it has reached 1 inch (2.5 cm) or more in diameter.
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