![]() ![]() At seedbed and transplanting, handpick and destroy egg masses.Gold-fringed stemborer can cause yield loss of about 30%.Its damage can be as high as 100% when severe. Striped stemborer is one of the most important insect pests in Asia.It can cause outbreaks and destroy rice fields. White stemborer is an important pest in rainfed wetland rice.Yellow stemborer damage can lead to about 20% yield loss in early planted rice crops, and 80% in late-planted crops.At late infection, plants develop whiteheads. Its damage can reduce the number of reproductive tillers. Stems can be pulled and dissected for larvae and pupae for confirmation of stem borer damage.Įxcessive boring through the sheath can destroy the crop. To confirm stem borer damage, visually inspect rice crop for deadhearts in the vegetative stages and whiteheads in reproductive stages. Frass or fecal matters inside the damaged stemsĭeadhearts and whiteheads symptoms may sometimes be confused with damages caused by rats, neck blast, and black bug diseases.Whiteheads during reproductive stage where the emerging panicles are whitish and unfilled or empty.Deadhearts or dead tillers that can be easily pulled from the base during the vegetative stages.How to identifyĬheck the field for the following damage symptoms: Stubble that remains in the field can harbor stem borer larvae and or pupae. Fields planted later favors more damage by the insect pests that have built up in fields that have been planted earlier. ![]() High nitrogenous field favors population buildup of the stem borers. Unlike other species of stem borers, the pink stem borer lay bare eggs between the leaf sheath and the stem. The presence of alternate hosts encourages the pink stem borer to develop, multiply and survive during winter or dry season. The pink stem borer is found in upland rice, which is grown near sugarcane or related grasses. Their final instars remain dormant in temperate areas during winter. Striped stem borer is most abundant in temperate countries and in non-flooded areas. They attach themselves to the tiller and bore into the stem. Second instar larvae enclose themselves in body leaf wrappings to make tubes and detach themselves from the leaf and falls onto the water surface. It is found in aquatic environments where there is continuous flooding. The yellow stem borer is a pest of deepwater rice. On older plants, they bore through the upper nodes and feed toward the base. The stem borer larvae bore at the base of the plants during the vegetative stage. They feed upon tillers and causes deadhearts or drying of the central tiller, during vegetative stage and causes whiteheads at reproductive stage. Stem borers can destroy rice at any stage of the plant from seedling to maturity. It is polyphagous and prefers sugarcane to rice. Īmong the stem borers, the pink stem borer is less important. These are the yellow stemborer, white stemborer, striped stemborer, gold-fringed stemborer, dark-headed striped stemborer, and the pink stemborer. ![]()
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