Effect on Sitophilus oryzae infestation on amylose content and weight loss of eight rice varieties

Abstract

Sitophilus oryzae is one of the primary pests that causes severe damage to food products. Damage of the grains cause a drastic dropping of rice quality, which significantly affected our rice industry. The amylose content and weight loss are two components that are affected due to the S. oryzae infestation. In this study, eight rice varieties namely Thai Pathumthani Fragrant White Rice 100%, Vietnam Long Grain White Rice 5%, Pakistan Basmathi Long Grain White Rice PK 385, Indian Steam Pusa 1121 Basmathi LGWR, Thai White Rice, Pakistan White Rice, Cambodian Fragrant Sen Kro Oub 5%, and Vietnamese White Fragrant Rice 2% were collected to investigate the amylose content and weight loss after six-month durations of the S. oryzae infestation. ANOVA analysis has shown a significant value, p-value=0.00, p <0.05 for the relationship between amylose content and rice varieties, whereas the weight loss in the eight rice varieties also showed a significant value, p-value= 0.00, p< 0.05. The Pakistan White Rice has recorded the highest percentage of weight loss (55.8%), while Cambodian Fragrant Sen Kro Oub 5% showed the lowest percentage of weight loss (23%). Despite the significant weight loss, the amylose content in each rice variety has showed a low rate, 2-9%. Results obtained from this study are considered as a fundamental data to strategize the S. oryzae pest management to make sure the continuity of rice supply for Malaysia

Influence of pest infestation, type of packages and different storage periods on seeds and essential oil composition of Coriander, Coriandrum sativum L. Family: Apiaceae

“…This finding similar to [33], [34] reported that Cigarette beetle as main insect of coriander and fennel plant during storage. Insect pests promote weight loss of the product stored, a very important factor, causing nutritional value loss, commercial loss, as well as quality degradation [35]. The obtained results in Table 4 show the first appearance and degree of pest infestations in different package types during six month of storage indicated that Polyethylene package have high tolerance of insect infestation comparing with other types.…”

Post-Harvest Constraints: Fungi and Insects Responsible for Rice (<i>Oryza</i> spp) Losses during Storage in Cameroon

“…The importation of white milled rice, its storage and retailing conditions, like packaging material, relative humidity and temperature might be favorable to the increases in grain moisture content, the development of colored grains, molds development and insect infestation. The consequence of insect infestation of cereal grains during storage is damage and huge quantitative losses that are also linked to economic, nutritional and quality losses [48]. The low level of insects in parboiled rice and the complete absence in domestic parboiled samples might be explained by the fact that parboiling heals the crevices on grains and further hardens the rice starch following gelatinization, rendering the grains resistant to insect invasion.…”

Insights of Circular economics practices in rice cultivation and processing - a review

“…S. oryae and S. cerealella have been found to cause more damage (Mason et al, 2012). Through this loss of nutritional value, commercial loss as well as quality deterioration of wealth, and there is a possibility of developing grain spoilage due to an increase in temperature and water content of grain stock due to insect activity (Adler et al, 2007;Zulaikha et al, 2021). Meanwhile, the use of fumigating chemicals, mainly fumigants, during storage is common worldwide, but their excessive use causes environmental problems and risks to human health (Lee et al, 2003;Chou et al, 2022).…”